code:
<?php
/**
 * *** BEGIN LICENSE BLOCK *****
 *
 * This file is part of FirePHP (http://www.firephp.org/).
 *
 * Software License Agreement (New BSD License)
 *
 * Copyright (c) 2006-2008, Christoph Dorn
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above copyright notice,
 *       this list of conditions and the following disclaimer in the documentation
 *       and/or other materials provided with the distribution.
 *
 *     * Neither the name of Christoph Dorn nor the names of its
 *       contributors may be used to endorse or promote products derived from this
 *       software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ***** END LICENSE BLOCK *****
 *
 * @copyright   Copyright (C) 2007-2008 Christoph Dorn
 * @author      Christoph Dorn <christoph@christophdorn.com>
 * @license     http://www.opensource.org/licenses/bsd-license.php
 * @package     FirePHP
 */

/**
 * Sends the given data to the FirePHP Firefox Extension.
 * The data can be displayed in the Firebug Console or in the
 * "Server" request tab.
 *
 * For more information see: http://www.firephp.org/
 *
 * @copyright   Copyright (C) 2007-2008 Christoph Dorn
 * @author      Christoph Dorn <christoph@christophdorn.com>
 * @license     http://www.opensource.org/licenses/bsd-license.php
 * @package     FirePHP
 */
class FirePHP {

  /**
   * FirePHP version
   *
   * @var string
   */
  const VERSION = '0.2.0';

  /**
   * Firebug LOG level
   *
   * Logs a message to firebug console.
   *
   * @var string
   */
  const LOG = 'LOG';

  /**
   * Firebug INFO level
   *
   * Logs a message to firebug console and displays an info icon before the message.
   *
   * @var string
   */
  const INFO = 'INFO';

  /**
   * Firebug WARN level
   *
   * Logs a message to firebug console, displays an warning icon before the message and colors the line turquoise.
   *
   * @var string
   */
  const WARN = 'WARN';

  /**
   * Firebug ERROR level
   *
   * Logs a message to firebug console, displays an error icon before the message and colors the line yellow. Also increments the firebug error count.
   *
   * @var string
   */
  const ERROR = 'ERROR';

  /**
   * Dumps a variable to firebug's server panel
   *
   * @var string
   */
  const DUMP = 'DUMP';

  /**
   * Displays a stack trace in firebug console
   *
   * @var string
   */
  const TRACE = 'TRACE';

  /**
   * Displays an exception in firebug console
   *
   * Increments the firebug error count.
   *
   * @var string
   */
  const EXCEPTION = 'EXCEPTION';

  /**
   * Displays an table in firebug console
   *
   * @var string
   */
  const TABLE = 'TABLE';

  /**
   * Starts a group in firebug console
   *
   * @var string
   */
  const GROUP_START = 'GROUP_START';

  /**
   * Ends a group in firebug console
   *
   * @var string
   */
  const GROUP_END = 'GROUP_END';

  /**
   * Singleton instance of FirePHP
   *
   * @var FirePHP
   */
  protected static $instance = null;

  /**
   * Wildfire protocol message index
   *
   * @var int
   */
  protected $messageIndex = 1;

  /**
   * Options for the library
   *
   * @var array
   */
  protected $options = array();

  /**
   * Filters used to exclude object members when encoding
   *
   * @var array
   */
  protected $objectFilters = array();

  /**
   * A stack of objects used to detect recursion during object encoding
   *
   * @var object
   */
  protected $objectStack = array();

  /**
   * Flag to enable/disable logging
   *
   * @var boolean
   */
  protected $enabled = true;

  /**
   * The object constructor
   */
  function __construct() {
    $this->options['maxObjectDepth'] = 10;
    $this->options['maxArrayDepth'] = 20;
    $this->options['useNativeJsonEncode'] = true;
    $this->options['includeLineNumbers'] = true;
  }

  /**
   * When the object gets serialized only include specific object members.
   *
   * @return array
   */
  public function __sleep() {
    return array('options','objectFilters','enabled');
  }

  /**
   * Gets singleton instance of FirePHP
   *
   * @param boolean $AutoCreate
   * @return FirePHP
   */
  public static function getInstance($AutoCreate=false) {
    if($AutoCreate===true && !self::$instance) {
      self::init();
    }
    return self::$instance;
  }

  /**
   * Creates FirePHP object and stores it for singleton access
   *
   * @return FirePHP
   */
  public static function init() {
    return self::$instance = new self();
  }

  /**
   * Enable and disable logging to Firebug
   *
   * @param boolean $Enabled TRUE to enable, FALSE to disable
   * @return void
   */
  public function setEnabled($Enabled) {
    $this->enabled = $Enabled;
  }

  /**
   * Check if logging is enabled
   *
   * @return boolean TRUE if enabled
   */
  public function getEnabled() {
    return $this->enabled;
  }

  /**
   * Specify a filter to be used when encoding an object
   *
   * Filters are used to exclude object members.
   *
   * @param string $Class The class name of the object
   * @param array $Filter An array or members to exclude
   * @return void
   */
  public function setObjectFilter($Class, $Filter) {
    $this->objectFilters[$Class] = $Filter;
  }

  /**
   * Set some options for the library
   *
   * Options:
   *  - maxObjectDepth: The maximum depth to traverse objects (default: 10)
   *  - maxArrayDepth: The maximum depth to traverse arrays (default: 20)
   *  - useNativeJsonEncode: If true will use json_encode() (default: true)
   *  - includeLineNumbers: If true will include line numbers and filenames (default: true)
   *
   * @param array $Options The options to be set
   * @return void
   */
  public function setOptions($Options) {
    $this->options = array_merge($this->options,$Options);
  }

  /**
   * Register FirePHP as your error handler
   *
   * Will throw exceptions for each php error.
   */
  public function registerErrorHandler()
  {
    //NOTE: The following errors will not be caught by this error handler:
    //      E_ERROR, E_PARSE, E_CORE_ERROR,
    //      E_CORE_WARNING, E_COMPILE_ERROR,
    //      E_COMPILE_WARNING, E_STRICT

    set_error_handler(array($this,'errorHandler'));
  }

  /**
   * FirePHP's error handler
   *
   * Throws exception for each php error that will occur.
   *
   * @param int $errno
   * @param string $errstr
   * @param string $errfile
   * @param int $errline
   * @param array $errcontext
   */
  public function errorHandler($errno, $errstr, $errfile, $errline, $errcontext)
  {
    // Don't throw exception if error reporting is switched off
    if (error_reporting() == 0) {
      return;
    }
    // Only throw exceptions for errors we are asking for
    if (error_reporting() & $errno) {
      throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
    }
  }

  /**
   * Register FirePHP as your exception handler
   */
  public function registerExceptionHandler()
  {
    set_exception_handler(array($this,'exceptionHandler'));
  }

  /**
   * FirePHP's exception handler
   *
   * Logs all exceptions to your firebug console and then stops the script.
   *
   * @param Exception $Exception
   * @throws Exception
   */
  function exceptionHandler($Exception) {
    $this->fb($Exception);
  }

  /**
   * Set custom processor url for FirePHP
   *
   * @param string $URL
   */
  public function setProcessorUrl($URL)
  {
    $this->setHeader('X-FirePHP-ProcessorURL', $URL);
  }

  /**
   * Set custom renderer url for FirePHP
   *
   * @param string $URL
   */
  public function setRendererUrl($URL)
  {
    $this->setHeader('X-FirePHP-RendererURL', $URL);
  }

  /**
   * Start a group for following messages
   *
   * @param string $Name
   * @return true
   * @throws Exception
   */
  public function group($Name) {
    return $this->fb(null, $Name, FirePHP::GROUP_START);
  }

  /**
   * Ends a group you have started before
   *
   * @return true
   * @throws Exception
   */
  public function groupEnd() {
    return $this->fb(null, null, FirePHP::GROUP_END);
  }

  /**
   * Log object with label to firebug console
   *
   * @see FirePHP::LOG
   * @param mixes $Object
   * @param string $Label
   * @return true
   * @throws Exception
   */
  public function log($Object, $Label=null) {
    return $this->fb($Object, $Label, FirePHP::LOG);
  }

  /**
   * Log object with label to firebug console
   *
   * @see FirePHP::INFO
   * @param mixes $Object
   * @param string $Label
   * @return true
   * @throws Exception
   */
  public function info($Object, $Label=null) {
    return $this->fb($Object, $Label, FirePHP::INFO);
  }

  /**
   * Log object with label to firebug console
   *
   * @see FirePHP::WARN
   * @param mixes $Object
   * @param string $Label
   * @return true
   * @throws Exception
   */
  public function warn($Object, $Label=null) {
    return $this->fb($Object, $Label, FirePHP::WARN);
  }

  /**
   * Log object with label to firebug console
   *
   * @see FirePHP::ERROR
   * @param mixes $Object
   * @param string $Label
   * @return true
   * @throws Exception
   */
  public function error($Object, $Label=null) {
    return $this->fb($Object, $Label, FirePHP::ERROR);
  }

  /**
   * Dumps key and variable to firebug server panel
   *
   * @see FirePHP::DUMP
   * @param string $Key
   * @param mixed $Variable
   * @return true
   * @throws Exception
   */
  public function dump($Key, $Variable) {
    return $this->fb($Variable, $Key, FirePHP::DUMP);
  }

  /**
   * Log a trace in the firebug console
   *
   * @see FirePHP::TRACE
   * @param string $Label
   * @return true
   * @throws Exception
   */
  public function trace($Label) {
    return $this->fb($Label, FirePHP::TRACE);
  }

  /**
   * Log a table in the firebug console
   *
   * @see FirePHP::TABLE
   * @param string $Label
   * @param string $Table
   * @return true
   * @throws Exception
   */
  public function table($Label, $Table) {
    return $this->fb($Table, $Label, FirePHP::TABLE);
  }

  /**
   * Check if FirePHP is installed on client
   *
   * @return boolean
   */
  public function detectClientExtension() {
    /* Check if FirePHP is installed on client */
    if(!@preg_match_all('/\sFirePHP\/([\.|\d]*)\s?/si',$this->getUserAgent(),$m) ||
       !version_compare($m[1][0],'0.0.6','>=')) {
      return false;
    }
    return true;
  }

  /**
   * Log varible to Firebug
   *
   * @see http://www.firephp.org/Wiki/Reference/Fb
   * @param mixed $Object The variable to be logged
   * @return true Return TRUE if message was added to headers, FALSE otherwise
   * @throws Exception
   */
  public function fb($Object) {

    if(!$this->enabled) {
      return false;
    }

    if (headers_sent($filename, $linenum)) {
        throw $this->newException('Headers already sent in '.$filename.' on line '.$linenum.'. Cannot send log data to FirePHP. You must have Output Buffering enabled via ob_start() or output_buffering ini directive.');
    }

    $Type = null;
    $Label = null;

    if(func_num_args()==1) {
    } else
    if(func_num_args()==2) {
      switch(func_get_arg(1)) {
        case self::LOG:
        case self::INFO:
        case self::WARN:
        case self::ERROR:
        case self::DUMP:
        case self::TRACE:
        case self::EXCEPTION:
        case self::TABLE:
        case self::GROUP_START:
        case self::GROUP_END:
          $Type = func_get_arg(1);
          break;
        default:
          $Label = func_get_arg(1);
          break;
      }
    } else
    if(func_num_args()==3) {
      $Type = func_get_arg(2);
      $Label = func_get_arg(1);
    } else {
      throw $this->newException('Wrong number of arguments to fb() function!');
    }

    if(!$this->detectClientExtension()) {
      return false;
    }

    $meta = array();
    $skipFinalObjectEncode = false;

    if($Object instanceof Exception) {

      $meta['file'] = $this->_escapeTraceFile($Object->getFile());
      $meta['line'] = $Object->getLine();

      $trace = $Object->getTrace();
      if($Object instanceof ErrorException
         && isset($trace[0]['function'])
         && $trace[0]['function']=='errorHandler'
         && isset($trace[0]['class'])
         && $trace[0]['class']=='FirePHP') {

        $severity = false;
        switch($Object->getSeverity()) {
          case E_WARNING: $severity = 'E_WARNING'; break;
          case E_NOTICE: $severity = 'E_NOTICE'; break;
          case E_USER_ERROR: $severity = 'E_USER_ERROR'; break;
          case E_USER_WARNING: $severity = 'E_USER_WARNING'; break;
          case E_USER_NOTICE: $severity = 'E_USER_NOTICE'; break;
          case E_STRICT: $severity = 'E_STRICT'; break;
          case E_RECOVERABLE_ERROR: $severity = 'E_RECOVERABLE_ERROR'; break;
          case E_DEPRECATED: $severity = 'E_DEPRECATED'; break;
          case E_USER_DEPRECATED: $severity = 'E_USER_DEPRECATED'; break;
        }

        $Object = array('Class'=>get_class($Object),
                        'Message'=>$severity.': '.$Object->getMessage(),
                        'File'=>$this->_escapeTraceFile($Object->getFile()),
                        'Line'=>$Object->getLine(),
                        'Type'=>'trigger',
                        'Trace'=>$this->_escapeTrace(array_splice($trace,2)));
        $skipFinalObjectEncode = true;
      } else {
        $Object = array('Class'=>get_class($Object),
                        'Message'=>$Object->getMessage(),
                        'File'=>$this->_escapeTraceFile($Object->getFile()),
                        'Line'=>$Object->getLine(),
                        'Type'=>'throw',
                        'Trace'=>$this->_escapeTrace($trace));
        $skipFinalObjectEncode = true;
      }
      $Type = self::EXCEPTION;

    } else
    if($Type==self::TRACE) {

      $trace = debug_backtrace();
      if(!$trace) return false;
      for( $i=0 ; $i<sizeof($trace) ; $i++ ) {

        if(isset($trace[$i]['class'])
           && isset($trace[$i]['file'])
           && ($trace[$i]['class']=='FirePHP'
               || $trace[$i]['class']=='FB')
           && (substr($this->_standardizePath($trace[$i]['file']),-18,18)=='FirePHPCore/fb.php'
               || substr($this->_standardizePath($trace[$i]['file']),-29,29)=='FirePHPCore/FirePHP.class.php')) {
          /* Skip - FB::trace(), FB::send(), $firephp->trace(), $firephp->fb() */
        } else
        if(isset($trace[$i]['class'])
           && isset($trace[$i+1]['file'])
           && $trace[$i]['class']=='FirePHP'
           && substr($this->_standardizePath($trace[$i+1]['file']),-18,18)=='FirePHPCore/fb.php') {
          /* Skip fb() */
        } else
        if($trace[$i]['function']=='fb'
           || $trace[$i]['function']=='trace'
           || $trace[$i]['function']=='send') {
          $Object = array('Class'=>isset($trace[$i]['class'])?$trace[$i]['class']:'',
                          'Type'=>isset($trace[$i]['type'])?$trace[$i]['type']:'',
                          'Function'=>isset($trace[$i]['function'])?$trace[$i]['function']:'',
                          'Message'=>$trace[$i]['args'][0],
                          'File'=>isset($trace[$i]['file'])?$this->_escapeTraceFile($trace[$i]['file']):'',
                          'Line'=>isset($trace[$i]['line'])?$trace[$i]['line']:'',
                          'Args'=>isset($trace[$i]['args'])?$this->encodeObject($trace[$i]['args']):'',
                          'Trace'=>$this->_escapeTrace(array_splice($trace,$i+1)));

          $skipFinalObjectEncode = true;
          $meta['file'] = isset($trace[$i]['file'])?$this->_escapeTraceFile($trace[$i]['file']):'';
          $meta['line'] = isset($trace[$i]['line'])?$trace[$i]['line']:'';
          break;
        }
      }

    } else
    if($Type==self::TABLE) {

      if(isset($Object[0]) && is_string($Object[0])) {
        $Object[1] = $this->encodeTable($Object[1]);
      } else {
        $Object = $this->encodeTable($Object);
      }

      $skipFinalObjectEncode = true;

    } else {
      if($Type===null) {
        $Type = self::LOG;
      }
    }

    if($this->options['includeLineNumbers']) {
      if(!isset($meta['file']) || !isset($meta['line'])) {

        $trace = debug_backtrace();
        for( $i=0 ; $trace && $i<sizeof($trace) ; $i++ ) {

          if(isset($trace[$i]['class'])
             && isset($trace[$i]['file'])
             && ($trace[$i]['class']=='FirePHP'
                 || $trace[$i]['class']=='FB')
             && (substr($this->_standardizePath($trace[$i]['file']),-18,18)=='FirePHPCore/fb.php'
                 || substr($this->_standardizePath($trace[$i]['file']),-29,29)=='FirePHPCore/FirePHP.class.php')) {
            /* Skip - FB::trace(), FB::send(), $firephp->trace(), $firephp->fb() */
          } else
          if(isset($trace[$i]['class'])
             && isset($trace[$i+1]['file'])
             && $trace[$i]['class']=='FirePHP'
             && substr($this->_standardizePath($trace[$i+1]['file']),-18,18)=='FirePHPCore/fb.php') {
            /* Skip fb() */
          } else
          if(isset($trace[$i]['file'])
             && substr($this->_standardizePath($trace[$i]['file']),-18,18)=='FirePHPCore/fb.php') {
            /* Skip FB::fb() */
          } else {
            $meta['file'] = isset($trace[$i]['file'])?$this->_escapeTraceFile($trace[$i]['file']):'';
            $meta['line'] = isset($trace[$i]['line'])?$trace[$i]['line']:'';
            break;
          }
        }

      }
    } else {
      unset($meta['file']);
      unset($meta['line']);
    }

  	$this->setHeader('X-Wf-Protocol-1','http://meta.wildfirehq.org/Protocol/JsonStream/0.2');
  	$this->setHeader('X-Wf-1-Plugin-1','http://meta.firephp.org/Wildfire/Plugin/FirePHP/Library-FirePHPCore/'.self::VERSION);

    $structure_index = 1;
    if($Type==self::DUMP) {
      $structure_index = 2;
    	$this->setHeader('X-Wf-1-Structure-2','http://meta.firephp.org/Wildfire/Structure/FirePHP/Dump/0.1');
    } else {
    	$this->setHeader('X-Wf-1-Structure-1','http://meta.firephp.org/Wildfire/Structure/FirePHP/FirebugConsole/0.1');
    }

    if($Type==self::DUMP) {
    	$msg = '{"'.$Label.'":'.$this->jsonEncode($Object, $skipFinalObjectEncode).'}';
    } else {
      $msg_meta = array('Type'=>$Type);
      if($Label!==null) {
        $msg_meta['Label'] = $Label;
      }
      if(isset($meta['file'])) {
        $msg_meta['File'] = $meta['file'];
      }
      if(isset($meta['line'])) {
        $msg_meta['Line'] = $meta['line'];
      }
    	$msg = '['.$this->jsonEncode($msg_meta).','.$this->jsonEncode($Object, $skipFinalObjectEncode).']';
    }

    $parts = explode("\n",chunk_split($msg, 5000, "\n"));

    for( $i=0 ; $i<count($parts) ; $i++) {

        $part = $parts[$i];
        if ($part) {

            if(count($parts)>2) {
              // Message needs to be split into multiple parts
              $this->setHeader('X-Wf-1-'.$structure_index.'-'.'1-'.$this->messageIndex,
                               (($i==0)?strlen($msg):'')
                               . '|' . $part . '|'
                               . (($i<count($parts)-2)?'\\':''));
            } else {
              $this->setHeader('X-Wf-1-'.$structure_index.'-'.'1-'.$this->messageIndex,
                               strlen($part) . '|' . $part . '|');
            }

            $this->messageIndex++;

            if ($this->messageIndex > 99999) {
                throw new Exception('Maximum number (99,999) of messages reached!');
            }
        }
    }

  	$this->setHeader('X-Wf-1-Index',$this->messageIndex-1);

    return true;
  }

  /**
   * Standardizes path for windows systems.
   *
   * @param string $Path
   * @return string
   */
  protected function _standardizePath($Path) {
    return preg_replace('/\\\\+/','/',$Path);
  }

  /**
   * Escape trace path for windows systems
   *
   * @param array $Trace
   * @return array
   */
  protected function _escapeTrace($Trace) {
    if(!$Trace) return $Trace;
    for( $i=0 ; $i<sizeof($Trace) ; $i++ ) {
      if(isset($Trace[$i]['file'])) {
        $Trace[$i]['file'] = $this->_escapeTraceFile($Trace[$i]['file']);
      }
      if(isset($Trace[$i]['args'])) {
        $Trace[$i]['args'] = $this->encodeObject($Trace[$i]['args']);
      }
    }
    return $Trace;
  }

  /**
   * Escape file information of trace for windows systems
   *
   * @param string $File
   * @return string
   */
  protected function _escapeTraceFile($File) {
    /* Check if we have a windows filepath */
    if(strpos($File,'\\')) {
      /* First strip down to single \ */

      $file = preg_replace('/\\\\+/','\\',$File);

      return $file;
    }
    return $File;
  }

  /**
   * Send header
   *
   * @param string $Name
   * @param string_type $Value
   */
  protected function setHeader($Name, $Value) {
    return header($Name.': '.$Value);
  }

  /**
   * Get user agent
   *
   * @return string|false
   */
  protected function getUserAgent() {
    if(!isset($_SERVER['HTTP_USER_AGENT'])) return false;
    return $_SERVER['HTTP_USER_AGENT'];
  }

  /**
   * Returns a new exception
   *
   * @param string $Message
   * @return Exception
   */
  protected function newException($Message) {
    return new Exception($Message);
  }

  /**
   * Encode an object into a JSON string
   *
   * Uses PHP's jeson_encode() if available
   *
   * @param object $Object The object to be encoded
   * @return string The JSON string
   */
  protected function jsonEncode($Object, $skipObjectEncode=false)
  {
    if(!$skipObjectEncode) {
      $Object = $this->encodeObject($Object);
    }

    if(function_exists('json_encode')
       && $this->options['useNativeJsonEncode']!=false) {

      return json_encode($Object);
    } else {
      return $this->json_encode($Object);
    }
  }

  /**
   * Encodes a table by encoding each row and column with encodeObject()
   *
   * @param array $Table The table to be encoded
   * @return array
   */
  protected function encodeTable($Table) {
    if(!$Table) return $Table;
    for( $i=0 ; $i<count($Table) ; $i++ ) {
      if(is_array($Table[$i])) {
        for( $j=0 ; $j<count($Table[$i]) ; $j++ ) {
          $Table[$i][$j] = $this->encodeObject($Table[$i][$j]);
        }
      }
    }
    return $Table;
  }

  /**
   * Encodes an object including members with
   * protected and private visibility
   *
   * @param Object $Object The object to be encoded
   * @param int $Depth The current traversal depth
   * @return array All members of the object
   */
  protected function encodeObject($Object, $ObjectDepth = 1, $ArrayDepth = 1)
  {
    $return = array();

    if (is_object($Object)) {

        if ($ObjectDepth > $this->options['maxObjectDepth']) {
          return '** Max Object Depth ('.$this->options['maxObjectDepth'].') **';
        }

        foreach ($this->objectStack as $refVal) {
            if ($refVal === $Object) {
                return '** Recursion ('.get_class($Object).') **';
            }
        }
        array_push($this->objectStack, $Object);

        $return['__className'] = $class = get_class($Object);

        $reflectionClass = new ReflectionClass($class);
        $properties = array();
        foreach( $reflectionClass->getProperties() as $property) {
          $properties[$property->getName()] = $property;
        }

        $members = (array)$Object;

        foreach( $properties as $raw_name => $property ) {

          $name = $raw_name;
          if($property->isStatic()) {
            $name = 'static:'.$name;
          }
          if($property->isPublic()) {
            $name = 'public:'.$name;
          } else
          if($property->isPrivate()) {
            $name = 'private:'.$name;
            $raw_name = "\0".$class."\0".$raw_name;
          } else
          if($property->isProtected()) {
            $name = 'protected:'.$name;
            $raw_name = "\0".'*'."\0".$raw_name;
          }

          if(!(isset($this->objectFilters[$class])
               && is_array($this->objectFilters[$class])
               && in_array($raw_name,$this->objectFilters[$class]))) {

            if(array_key_exists($raw_name,$members)
               && !$property->isStatic()) {

              $return[$name] = $this->encodeObject($members[$raw_name], $ObjectDepth + 1, 1);

            } else {
              if(method_exists($property,'setAccessible')) {
                $property->setAccessible(true);
                $return[$name] = $this->encodeObject($property->getValue($Object), $ObjectDepth + 1, 1);
              } else
              if($property->isPublic()) {
                $return[$name] = $this->encodeObject($property->getValue($Object), $ObjectDepth + 1, 1);
              } else {
                $return[$name] = '** Need PHP 5.3 to get value **';
              }
            }
          } else {
            $return[$name] = '** Excluded by Filter **';
          }
        }

        // Include all members that are not defined in the class
        // but exist in the object
        foreach( $members as $raw_name => $value ) {

          $name = $raw_name;

          if ($name{0} == "\0") {
            $parts = explode("\0", $name);
            $name = $parts[2];
          }

          if(!isset($properties[$name])) {
            $name = 'undeclared:'.$name;

            if(!(isset($this->objectFilters[$class])
                 && is_array($this->objectFilters[$class])
                 && in_array($raw_name,$this->objectFilters[$class]))) {

              $return[$name] = $this->encodeObject($value, $ObjectDepth + 1, 1);
            } else {
              $return[$name] = '** Excluded by Filter **';
            }
          }
        }

        array_pop($this->objectStack);

    } elseif (is_array($Object)) {

        if ($ArrayDepth > $this->options['maxArrayDepth']) {
          return '** Max Array Depth ('.$this->options['maxArrayDepth'].') **';
        }

        foreach ($Object as $key => $val) {

          // Encoding the $GLOBALS PHP array causes an infinite loop
          // if the recursion is not reset here as it contains
          // a reference to itself. This is the only way I have come up
          // with to stop infinite recursion in this case.
          if($key=='GLOBALS'
             && is_array($val)
             && array_key_exists('GLOBALS',$val)) {
            $val['GLOBALS'] = '** Recursion (GLOBALS) **';
          }

          $return[$key] = $this->encodeObject($val, 1, $ArrayDepth + 1);
        }
    } else {
      if(self::is_utf8($Object)) {
        return $Object;
      } else {
        return utf8_encode($Object);
      }
    }
    return $return;
  }

  /**
   * Returns true if $string is valid UTF-8 and false otherwise.
   *
   * @param mixed $str String to be tested
   * @return boolean
   */
  protected static function is_utf8($str) {
    $c=0; $b=0;
    $bits=0;
    $len=strlen($str);
    for($i=0; $i<$len; $i++){
        $c=ord($str[$i]);
        if($c > 128){
            if(($c >= 254)) return false;
            elseif($c >= 252) $bits=6;
            elseif($c >= 248) $bits=5;
            elseif($c >= 240) $bits=4;
            elseif($c >= 224) $bits=3;
            elseif($c >= 192) $bits=2;
            else return false;
            if(($i+$bits) > $len) return false;
            while($bits > 1){
                $i++;
                $b=ord($str[$i]);
                if($b < 128 || $b > 191) return false;
                $bits--;
            }
        }
    }
    return true;
  }

  /**
   * Converts to and from JSON format.
   *
   * JSON (JavaScript Object Notation) is a lightweight data-interchange
   * format. It is easy for humans to read and write. It is easy for machines
   * to parse and generate. It is based on a subset of the JavaScript
   * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
   * This feature can also be found in  Python. JSON is a text format that is
   * completely language independent but uses conventions that are familiar
   * to programmers of the C-family of languages, including C, C++, C#, Java,
   * JavaScript, Perl, TCL, and many others. These properties make JSON an
   * ideal data-interchange language.
   *
   * This package provides a simple encoder and decoder for JSON notation. It
   * is intended for use with client-side Javascript applications that make
   * use of HTTPRequest to perform server communication functions - data can
   * be encoded into JSON notation for use in a client-side javascript, or
   * decoded from incoming Javascript requests. JSON format is native to
   * Javascript, and can be directly eval()'ed with no further parsing
   * overhead
   *
   * All strings should be in ASCII or UTF-8 format!
   *
   * LICENSE: Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met: Redistributions of source code must retain the
   * above copyright notice, this list of conditions and the following
   * disclaimer. Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
   * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
   * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
   * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * @category
   * @package     Services_JSON
   * @author      Michal Migurski <mike-json@teczno.com>
   * @author      Matt Knapp <mdknapp[at]gmail[dot]com>
   * @author      Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
   * @author      Christoph Dorn <christoph@christophdorn.com>
   * @copyright   2005 Michal Migurski
   * @version     CVS: $Id: JSON.php,v 1.31 2006/06/28 05:54:17 migurski Exp $
   * @license     http://www.opensource.org/licenses/bsd-license.php
   * @link        http://pear.php.net/pepr/pepr-proposal-show.php?id=198
   */

  /**
   * Keep a list of objects as we descend into the array so we can detect recursion.
   */
  private $json_objectStack = array();

 /**
  * convert a string from one UTF-8 char to one UTF-16 char
  *
  * Normally should be handled by mb_convert_encoding, but
  * provides a slower PHP-only method for installations
  * that lack the multibye string extension.
  *
  * @param    string  $utf8   UTF-8 character
  * @return   string  UTF-16 character
  * @access   private
  */
  private function json_utf82utf16($utf8)
  {
      // oh please oh please oh please oh please oh please
      if(function_exists('mb_convert_encoding')) {
          return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
      }

      switch(strlen($utf8)) {
          case 1:
              // this case should never be reached, because we are in ASCII range
              // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
              return $utf8;

          case 2:
              // return a UTF-16 character from a 2-byte UTF-8 char
              // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
              return chr(0x07 & (ord($utf8{0}) >> 2))
                   . chr((0xC0 & (ord($utf8{0}) << 6))
                       | (0x3F & ord($utf8{1})));

          case 3:
              // return a UTF-16 character from a 3-byte UTF-8 char
              // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
              return chr((0xF0 & (ord($utf8{0}) << 4))
                       | (0x0F & (ord($utf8{1}) >> 2)))
                   . chr((0xC0 & (ord($utf8{1}) << 6))
                       | (0x7F & ord($utf8{2})));
      }

      // ignoring UTF-32 for now, sorry
      return '';
  }

 /**
  * encodes an arbitrary variable into JSON format
  *
  * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
  *                           see argument 1 to Services_JSON() above for array-parsing behavior.
  *                           if var is a strng, note that encode() always expects it
  *                           to be in ASCII or UTF-8 format!
  *
  * @return   mixed   JSON string representation of input var or an error if a problem occurs
  * @access   public
  */
  private function json_encode($var)
  {

    if(is_object($var)) {
      if(in_array($var,$this->json_objectStack)) {
        return '"** Recursion **"';
      }
    }

      switch (gettype($var)) {
          case 'boolean':
              return $var ? 'true' : 'false';

          case 'NULL':
              return 'null';

          case 'integer':
              return (int) $var;

          case 'double':
          case 'float':
              return (float) $var;

          case 'string':
              // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
              $ascii = '';
              $strlen_var = strlen($var);

             /*
              * Iterate over every character in the string,
              * escaping with a slash or encoding to UTF-8 where necessary
              */
              for ($c = 0; $c < $strlen_var; ++$c) {

                  $ord_var_c = ord($var{$c});

                  switch (true) {
                      case $ord_var_c == 0x08:
                          $ascii .= '\b';
                          break;
                      case $ord_var_c == 0x09:
                          $ascii .= '\t';
                          break;
                      case $ord_var_c == 0x0A:
                          $ascii .= '\n';
                          break;
                      case $ord_var_c == 0x0C:
                          $ascii .= '\f';
                          break;
                      case $ord_var_c == 0x0D:
                          $ascii .= '\r';
                          break;

                      case $ord_var_c == 0x22:
                      case $ord_var_c == 0x2F:
                      case $ord_var_c == 0x5C:
                          // double quote, slash, slosh
                          $ascii .= '\\'.$var{$c};
                          break;

                      case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
                          // characters U-00000000 - U-0000007F (same as ASCII)
                          $ascii .= $var{$c};
                          break;

                      case (($ord_var_c & 0xE0) == 0xC0):
                          // characters U-00000080 - U-000007FF, mask 110XXXXX
                          // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                          $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
                          $c += 1;
                          $utf16 = $this->json_utf82utf16($char);
                          $ascii .= sprintf('\u%04s', bin2hex($utf16));
                          break;

                      case (($ord_var_c & 0xF0) == 0xE0):
                          // characters U-00000800 - U-0000FFFF, mask 1110XXXX
                          // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                          $char = pack('C*', $ord_var_c,
                                       ord($var{$c + 1}),
                                       ord($var{$c + 2}));
                          $c += 2;
                          $utf16 = $this->json_utf82utf16($char);
                          $ascii .= sprintf('\u%04s', bin2hex($utf16));
                          break;

                      case (($ord_var_c & 0xF8) == 0xF0):
                          // characters U-00010000 - U-001FFFFF, mask 11110XXX
                          // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                          $char = pack('C*', $ord_var_c,
                                       ord($var{$c + 1}),
                                       ord($var{$c + 2}),
                                       ord($var{$c + 3}));
                          $c += 3;
                          $utf16 = $this->json_utf82utf16($char);
                          $ascii .= sprintf('\u%04s', bin2hex($utf16));
                          break;

                      case (($ord_var_c & 0xFC) == 0xF8):
                          // characters U-00200000 - U-03FFFFFF, mask 111110XX
                          // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                          $char = pack('C*', $ord_var_c,
                                       ord($var{$c + 1}),
                                       ord($var{$c + 2}),
                                       ord($var{$c + 3}),
                                       ord($var{$c + 4}));
                          $c += 4;
                          $utf16 = $this->json_utf82utf16($char);
                          $ascii .= sprintf('\u%04s', bin2hex($utf16));
                          break;

                      case (($ord_var_c & 0xFE) == 0xFC):
                          // characters U-04000000 - U-7FFFFFFF, mask 1111110X
                          // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                          $char = pack('C*', $ord_var_c,
                                       ord($var{$c + 1}),
                                       ord($var{$c + 2}),
                                       ord($var{$c + 3}),
                                       ord($var{$c + 4}),
                                       ord($var{$c + 5}));
                          $c += 5;
                          $utf16 = $this->json_utf82utf16($char);
                          $ascii .= sprintf('\u%04s', bin2hex($utf16));
                          break;
                  }
              }

              return '"'.$ascii.'"';

          case 'array':
             /*
              * As per JSON spec if any array key is not an integer
              * we must treat the the whole array as an object. We
              * also try to catch a sparsely populated associative
              * array with numeric keys here because some JS engines
              * will create an array with empty indexes up to
              * max_index which can cause memory issues and because
              * the keys, which may be relevant, will be remapped
              * otherwise.
              *
              * As per the ECMA and JSON specification an object may
              * have any string as a property. Unfortunately due to
              * a hole in the ECMA specification if the key is a
              * ECMA reserved word or starts with a digit the
              * parameter is only accessible using ECMAScript's
              * bracket notation.
              */

              // treat as a JSON object
              if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {

                  $this->json_objectStack[] = $var;

                  $properties = array_map(array($this, 'json_name_value'),
                                          array_keys($var),
                                          array_values($var));

                  array_pop($this->json_objectStack);

                  foreach($properties as $property) {
                      if($property instanceof Exception) {
                          return $property;
                      }
                  }

                  return '{' . join(',', $properties) . '}';
              }

              $this->json_objectStack[] = $var;

              // treat it like a regular array
              $elements = array_map(array($this, 'json_encode'), $var);

              array_pop($this->json_objectStack);

              foreach($elements as $element) {
                  if($element instanceof Exception) {
                      return $element;
                  }
              }

              return '[' . join(',', $elements) . ']';

          case 'object':
              $vars = self::encodeObject($var);

              $this->json_objectStack[] = $var;

              $properties = array_map(array($this, 'json_name_value'),
                                      array_keys($vars),
                                      array_values($vars));

              array_pop($this->json_objectStack);

              foreach($properties as $property) {
                  if($property instanceof Exception) {
                      return $property;
                  }
              }

              return '{' . join(',', $properties) . '}';

          default:
              return null;
      }
  }

 /**
  * array-walking function for use in generating JSON-formatted name-value pairs
  *
  * @param    string  $name   name of key to use
  * @param    mixed   $value  reference to an array element to be encoded
  *
  * @return   string  JSON-formatted name-value pair, like '"name":value'
  * @access   private
  */
  private function json_name_value($name, $value)
  {
      // Encoding the $GLOBALS PHP array causes an infinite loop
      // if the recursion is not reset here as it contains
      // a reference to itself. This is the only way I have come up
      // with to stop infinite recursion in this case.
      if($name=='GLOBALS'
         && is_array($value)
         && array_key_exists('GLOBALS',$value)) {
        $value['GLOBALS'] = '** Recursion **';
      }

      $encoded_value = $this->json_encode($value);

      if($encoded_value instanceof Exception) {
          return $encoded_value;
      }

      return $this->json_encode(strval($name)) . ':' . $encoded_value;
  }
}


code:
<?php
/**
 * Class HTTP_ConditionalGet
 * @package Minify
 * @subpackage HTTP
 */

/**
 * Implement conditional GET via a timestamp or hash of content
 *
 * E.g. Content from DB with update time:
 *
 * list($updateTime, $content) = getDbUpdateAndContent();
 * $cg = new HTTP_ConditionalGet(array(
 *     'lastModifiedTime' => $updateTime
 *     ,'isPublic' => true
 * ));
 * $cg->sendHeaders();
 * if ($cg->cacheIsValid) {
 *     exit();
 * }
 * echo $content;
 *
 *
 * E.g. Shortcut for the above
 *
 * HTTP_ConditionalGet::check($updateTime, true); // exits if client has cache
 * echo $content;
 *
 *
 * E.g. Content from DB with no update time:
 *
 * $content = getContentFromDB();
 * $cg = new HTTP_ConditionalGet(array(
 *     'contentHash' => md5($content)
 * ));
 * $cg->sendHeaders();
 * if ($cg->cacheIsValid) {
 *     exit();
 * }
 * echo $content;
 *
 *
 * E.g. Static content with some static includes:
 *
 * // before content
 * $cg = new HTTP_ConditionalGet(array(
 *     'lastUpdateTime' => max(
 *         filemtime(__FILE__)
 *         ,filemtime('/path/to/header.inc')
 *         ,filemtime('/path/to/footer.inc')
 *     )
 * ));
 * $cg->sendHeaders();
 * if ($cg->cacheIsValid) {
 *     exit();
 * }
 *
 * @package Minify
 * @subpackage HTTP
 * @author Stephen Clay <steve@mrclay.org>
 */
class HTTP_ConditionalGet {

    /**
     * Does the client have a valid copy of the requested resource?
     *
     * You'll want to check this after instantiating the object. If true, do
     * not send content, just call sendHeaders() if you haven't already.
     *
     * @var bool
     */
    public $cacheIsValid = null;

    /**
     * @param array $spec options
     *
     * 'isPublic': (bool) if true, the Cache-Control header will contain
     * "public", allowing proxies to cache the content. Otherwise "private" will
     * be sent, allowing only browser caching. (default false)
     *
     * 'lastModifiedTime': (int) if given, both ETag AND Last-Modified headers
     * will be sent with content. This is recommended.
     *
     * 'encoding': (string) if set, the header "Vary: Accept-Encoding" will
     * always be sent and a truncated version of the encoding will be appended
     * to the ETag. E.g. "pub123456;gz". This will also trigger a more lenient
     * checking of the client's If-None-Match header, as the encoding portion of
     * the ETag will be stripped before comparison.
     *
     * 'contentHash': (string) if given, only the ETag header can be sent with
     * content (only HTTP1.1 clients can conditionally GET). The given string
     * should be short with no quote characters and always change when the
     * resource changes (recommend md5()). This is not needed/used if
     * lastModifiedTime is given.
     *
     * 'eTag': (string) if given, this will be used as the ETag header rather
     * than values based on lastModifiedTime or contentHash. Also the encoding
     * string will not be appended to the given value as described above.
     *
     * 'invalidate': (bool) if true, the client cache will be considered invalid
     * without testing. Effectively this disables conditional GET.
     * (default false)
     *
     * 'maxAge': (int) if given, this will set the Cache-Control max-age in
     * seconds, and also set the Expires header to the equivalent GMT date.
     * After the max-age period has passed, the browser will again send a
     * conditional GET to revalidate its cache.
     *
     * @return null
     */
    public function __construct($spec)
    {
        $scope = (isset($spec['isPublic']) && $spec['isPublic'])
            ? 'public'
            : 'private';
        $maxAge = 0;
        // backwards compatibility (can be removed later)
        if (isset($spec['setExpires'])
            && is_numeric($spec['setExpires'])
            && ! isset($spec['maxAge'])) {
            $spec['maxAge'] = $spec['setExpires'] - $_SERVER['REQUEST_TIME'];
        }
        if (isset($spec['maxAge'])) {
            $maxAge = $spec['maxAge'];
            $this->_headers['Expires'] = self::gmtDate(
                $_SERVER['REQUEST_TIME'] + $spec['maxAge']
            );
        }
        $etagAppend = '';
        if (isset($spec['encoding'])) {
            $this->_stripEtag = true;
            $this->_headers['Vary'] = 'Accept-Encoding';
            if ('' !== $spec['encoding']) {
                if (0 === strpos($spec['encoding'], 'x-')) {
                    $spec['encoding'] = substr($spec['encoding'], 2);
                }
                $etagAppend = ';' . substr($spec['encoding'], 0, 2);
            }
        }
        if (isset($spec['lastModifiedTime'])) {
            $this->_setLastModified($spec['lastModifiedTime']);
            if (isset($spec['eTag'])) { // Use it
                $this->_setEtag($spec['eTag'], $scope);
            } else { // base both headers on time
                $this->_setEtag($spec['lastModifiedTime'] . $etagAppend, $scope);
            }
        } elseif (isset($spec['eTag'])) { // Use it
            $this->_setEtag($spec['eTag'], $scope);
        } elseif (isset($spec['contentHash'])) { // Use the hash as the ETag
            $this->_setEtag($spec['contentHash'] . $etagAppend, $scope);
        }
        $this->_headers['Cache-Control'] = "max-age={$maxAge}, {$scope}";
        // invalidate cache if disabled, otherwise check
        $this->cacheIsValid = (isset($spec['invalidate']) && $spec['invalidate'])
            ? false
            : $this->_isCacheValid();
    }

    /**
     * Get array of output headers to be sent
     *
     * In the case of 304 responses, this array will only contain the response
     * code header: array('_responseCode' => 'HTTP/1.0 304 Not Modified')
     *
     * Otherwise something like:
     *
     * array(
     *     'Cache-Control' => 'max-age=0, public'
     *     ,'ETag' => '"foobar"'
     * )
     *
     *
     * @return array
     */
    public function getHeaders()
    {
        return $this->_headers;
    }

    /**
     * Set the Content-Length header in bytes
     *
     * With most PHP configs, as long as you don't flush() output, this method
     * is not needed and PHP will buffer all output and set Content-Length for
     * you. Otherwise you'll want to call this to let the client know up front.
     *
     * @param int $bytes
     *
     * @return int copy of input $bytes
     */
    public function setContentLength($bytes)
    {
        return $this->_headers['Content-Length'] = $bytes;
    }

    /**
     * Send headers
     *
     * @see getHeaders()
     *
     * Note this doesn't "clear" the headers. Calling sendHeaders() will
     * call header() again (but probably have not effect) and getHeaders() will
     * still return the headers.
     *
     * @return null
     */
    public function sendHeaders()
    {
        $headers = $this->_headers;
        if (array_key_exists('_responseCode', $headers)) {
            header($headers['_responseCode']);
            unset($headers['_responseCode']);
        }
        foreach ($headers as $name => $val) {
            header($name . ': ' . $val);
        }
    }

    /**
     * Exit if the client's cache is valid for this resource
     *
     * This is a convenience method for common use of the class
     *
     * @param int $lastModifiedTime if given, both ETag AND Last-Modified headers
     * will be sent with content. This is recommended.
     *
     * @param bool $isPublic (default false) if true, the Cache-Control header
     * will contain "public", allowing proxies to cache the content. Otherwise
     * "private" will be sent, allowing only browser caching.
     *
     * @param array $options (default empty) additional options for constructor
     *
     * @return null
     */
    public static function check($lastModifiedTime = null, $isPublic = false, $options = array())
    {
        if (null !== $lastModifiedTime) {
            $options['lastModifiedTime'] = (int)$lastModifiedTime;
        }
        $options['isPublic'] = (bool)$isPublic;
        $cg = new HTTP_ConditionalGet($options);
        $cg->sendHeaders();
        if ($cg->cacheIsValid) {
            exit();
        }
    }

    /**
     * Get a GMT formatted date for use in HTTP headers
     *
     *
     * header('Expires: ' . HTTP_ConditionalGet::gmtdate($time));
     *
     *
     * @param int $time unix timestamp
     *
     * @return string
     */
    public static function gmtDate($time)
    {
        return gmdate('D, d M Y H:i:s \G\M\T', $time);
    }

    protected $_headers = array();
    protected $_lmTime = null;
    protected $_etag = null;
    protected $_stripEtag = false;

    protected function _setEtag($hash, $scope)
    {
        $this->_etag = '"' . substr($scope, 0, 3) . $hash . '"';
        $this->_headers['ETag'] = $this->_etag;
    }

    protected function _setLastModified($time)
    {
        $this->_lmTime = (int)$time;
        $this->_headers['Last-Modified'] = self::gmtDate($time);
    }

    /**
     * Determine validity of client cache and queue 304 header if valid
     */
    protected function _isCacheValid()
    {
        if (null === $this->_etag) {
            // lmTime is copied to ETag, so this condition implies that the
            // server sent neither ETag nor Last-Modified, so the client can't
            // possibly has a valid cache.
            return false;
        }
        $isValid = ($this->resourceMatchedEtag() || $this->resourceNotModified());
        if ($isValid) {
            $this->_headers['_responseCode'] = 'HTTP/1.0 304 Not Modified';
        }
        return $isValid;
    }

    protected function resourceMatchedEtag()
    {
        if (!isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
            return false;
        }
        $clientEtagList = get_magic_quotes_gpc()
            ? stripslashes($_SERVER['HTTP_IF_NONE_MATCH'])
            : $_SERVER['HTTP_IF_NONE_MATCH'];
        $clientEtags = explode(',', $clientEtagList);

        $compareTo = $this->normalizeEtag($this->_etag);
        foreach ($clientEtags as $clientEtag) {
            if ($this->normalizeEtag($clientEtag) === $compareTo) {
                // respond with the client's matched ETag, even if it's not what
                // we would've sent by default
                $this->_headers['ETag'] = trim($clientEtag);
                return true;
            }
        }
        return false;
    }

    protected function normalizeEtag($etag) {
        $etag = trim($etag);
        return $this->_stripEtag
            ? preg_replace('/;\\w\\w"$/', '"', $etag)
            : $etag;
    }

    protected function resourceNotModified()
    {
        if (!isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
            return false;
        }
        $ifModifiedSince = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
        if (false !== ($semicolon = strrpos($ifModifiedSince, ';'))) {
            // IE has tacked on extra data to this header, strip it
            $ifModifiedSince = substr($ifModifiedSince, 0, $semicolon);
        }
        if ($ifModifiedSince == self::gmtDate($this->_lmTime)) {
            // Apache 2.2's behavior. If there was no ETag match, send the
            // non-encoded version of the ETag value.
            $this->_headers['ETag'] = $this->normalizeEtag($this->_etag);
            return true;
        }
        return false;
    }
}

repo_name: piratas/tortuga

license: mit


code:
<?php
/**
 * Class HTTP_Encoder
 * @package Minify
 * @subpackage HTTP
 */

/**
 * Encode and send gzipped/deflated content
 *
 * The "Vary: Accept-Encoding" header is sent. If the client allows encoding,
 * Content-Encoding and Content-Length are added.
 *
 *
 * // Send a CSS file, compressed if possible
 * $he = new HTTP_Encoder(array(
 *     'content' => file_get_contents($cssFile)
 *     ,'type' => 'text/css'
 * ));
 * $he->encode();
 * $he->sendAll();
 *
 *
 *
 * // Shortcut to encoding output
 * header('Content-Type: text/css'); // needed if not HTML
 * HTTP_Encoder::output($css);
 *
 *
 *
 * // Just sniff for the accepted encoding
 * $encoding = HTTP_Encoder::getAcceptedEncoding();
 *
 *
 * For more control over headers, use getHeaders() and getData() and send your
 * own output.
 *
 * Note: If you don't need header mgmt, use PHP's native gzencode, gzdeflate,
 * and gzcompress functions for gzip, deflate, and compress-encoding
 * respectively.
 *
 * @package Minify
 * @subpackage HTTP
 * @author Stephen Clay <steve@mrclay.org>
 */
class HTTP_Encoder {

    /**
     * Should the encoder allow HTTP encoding to IE6?
     *
     * If you have many IE6 users and the bandwidth savings is worth troubling
     * some of them, set this to true.
     *
     * By default, encoding is only offered to IE7+. When this is true,
     * getAcceptedEncoding() will return an encoding for IE6 if its user agent
     * string contains "SV1". This has been documented in many places as "safe",
     * but there seem to be remaining, intermittent encoding bugs in patched
     * IE6 on the wild web.
     *
     * @var bool
     */
    public static $encodeToIe6 = false;

    /**
     * Default compression level for zlib operations
     *
     * This level is used if encode() is not given a $compressionLevel
     *
     * @var int
     */
    public static $compressionLevel = 6;

    /**
     * Get an HTTP Encoder object
     *
     * @param array $spec options
     *
     * 'content': (string required) content to be encoded
     *
     * 'type': (string) if set, the Content-Type header will have this value.
     *
     * 'method: (string) only set this if you are forcing a particular encoding
     * method. If not set, the best method will be chosen by getAcceptedEncoding()
     * The available methods are 'gzip', 'deflate', 'compress', and '' (no
     * encoding)
     *
     * @return null
     */
    public function __construct($spec)
    {
        $this->_content = $spec['content'];
        $this->_headers['Content-Length'] = (string)strlen($this->_content);
        if (isset($spec['type'])) {
            $this->_headers['Content-Type'] = $spec['type'];
        }
        if (isset($spec['method'])
            && in_array($spec['method'], array('gzip', 'deflate', 'compress', '')))
        {
            $this->_encodeMethod = array($spec['method'], $spec['method']);
        } else {
            $this->_encodeMethod = self::getAcceptedEncoding();
        }
    }

    /**
     * Get content in current form
     *
     * Call after encode() for encoded content.
     *
     * return string
     */
    public function getContent()
    {
        return $this->_content;
    }

    /**
     * Get array of output headers to be sent
     *
     * E.g.
     *
     * array(
     *     'Content-Length' => '615'
     *     ,'Content-Encoding' => 'x-gzip'
     *     ,'Vary' => 'Accept-Encoding'
     * )
     *
     *
     * @return array
     */
    public function getHeaders()
    {
        return $this->_headers;
    }

    /**
     * Send output headers
     *
     * You must call this before headers are sent and it probably cannot be
     * used in conjunction with zlib output buffering / mod_gzip. Errors are
     * not handled purposefully.
     *
     * @see getHeaders()
     *
     * @return null
     */
    public function sendHeaders()
    {
        foreach ($this->_headers as $name => $val) {
            header($name . ': ' . $val);
        }
    }

    /**
     * Send output headers and content
     *
     * A shortcut for sendHeaders() and echo getContent()
     *
     * You must call this before headers are sent and it probably cannot be
     * used in conjunction with zlib output buffering / mod_gzip. Errors are
     * not handled purposefully.
     *
     * @return null
     */
    public function sendAll()
    {
        $this->sendHeaders();
        echo $this->_content;
    }

    /**
     * Determine the client's best encoding method from the HTTP Accept-Encoding
     * header.
     *
     * If no Accept-Encoding header is set, or the browser is IE before v6 SP2,
     * this will return ('', ''), the "identity" encoding.
     *
     * A syntax-aware scan is done of the Accept-Encoding, so the method must
     * be non 0. The methods are favored in order of gzip, deflate, then
     * compress. Deflate is always smallest and generally faster, but is
     * rarely sent by servers, so client support could be buggier.
     *
     * @param bool $allowCompress allow the older compress encoding
     *
     * @param bool $allowDeflate allow the more recent deflate encoding
     *
     * @return array two values, 1st is the actual encoding method, 2nd is the
     * alias of that method to use in the Content-Encoding header (some browsers
     * call gzip "x-gzip" etc.)
     */
    public static function getAcceptedEncoding($allowCompress = true, $allowDeflate = true)
    {
        // @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html

        if (! isset($_SERVER['HTTP_ACCEPT_ENCODING'])
            || self::_isBuggyIe())
        {
            return array('', '');
        }
        $ae = $_SERVER['HTTP_ACCEPT_ENCODING'];
        // gzip checks (quick)
        if (0 === strpos($ae, 'gzip,')             // most browsers
            || 0 === strpos($ae, 'deflate, gzip,') // opera
        ) {
            return array('gzip', 'gzip');
        }
        // gzip checks (slow)
        if (preg_match(
                '@(?:^|,)\\s*((?:x-)?gzip)\\s*(?:$|,|;\\s*q=(?:0\\.|1))@'
                ,$ae
                ,$m)) {
            return array('gzip', $m[1]);
        }
        if ($allowDeflate) {
            // deflate checks
            $aeRev = strrev($ae);
            if (0 === strpos($aeRev, 'etalfed ,') // ie, webkit
                || 0 === strpos($aeRev, 'etalfed,') // gecko
                || 0 === strpos($ae, 'deflate,') // opera
                // slow parsing
                || preg_match(
                    '@(?:^|,)\\s*deflate\\s*(?:$|,|;\\s*q=(?:0\\.|1))@', $ae)) {
                return array('deflate', 'deflate');
            }
        }
        if ($allowCompress && preg_match(
                '@(?:^|,)\\s*((?:x-)?compress)\\s*(?:$|,|;\\s*q=(?:0\\.|1))@'
                ,$ae
                ,$m)) {
            return array('compress', $m[1]);
        }
        return array('', '');
    }

    /**
     * Encode (compress) the content
     *
     * If the encode method is '' (none) or compression level is 0, or the 'zlib'
     * extension isn't loaded, we return false.
     *
     * Then the appropriate gz_* function is called to compress the content. If
     * this fails, false is returned.
     *
     * The header "Vary: Accept-Encoding" is added. If encoding is successful,
     * the Content-Length header is updated, and Content-Encoding is also added.
     *
     * @param int $compressionLevel given to zlib functions. If not given, the
     * class default will be used.
     *
     * @return bool success true if the content was actually compressed
     */
    public function encode($compressionLevel = null)
    {
        $this->_headers['Vary'] = 'Accept-Encoding';
        if (null === $compressionLevel) {
            $compressionLevel = self::$compressionLevel;
        }
        if ('' === $this->_encodeMethod[0]
            || ($compressionLevel == 0)
            || !extension_loaded('zlib'))
        {
            return false;
        }
        if ($this->_encodeMethod[0] === 'deflate') {
            $encoded = gzdeflate($this->_content, $compressionLevel);
        } elseif ($this->_encodeMethod[0] === 'gzip') {
            $encoded = gzencode($this->_content, $compressionLevel);
        } else {
            $encoded = gzcompress($this->_content, $compressionLevel);
        }
        if (false === $encoded) {
            return false;
        }
        $this->_headers['Content-Length'] = strlen($encoded);
        $this->_headers['Content-Encoding'] = $this->_encodeMethod[1];
        $this->_content = $encoded;
        return true;
    }

    /**
     * Encode and send appropriate headers and content
     *
     * This is a convenience method for common use of the class
     *
     * @param string $content
     *
     * @param int $compressionLevel given to zlib functions. If not given, the
     * class default will be used.
     *
     * @return bool success true if the content was actually compressed
     */
    public static function output($content, $compressionLevel = null)
    {
        if (null === $compressionLevel) {
            $compressionLevel = self::$compressionLevel;
        }
        $he = new HTTP_Encoder(array('content' => $content));
        $ret = $he->encode($compressionLevel);
        $he->sendAll();
        return $ret;
    }

    protected $_content = '';
    protected $_headers = array();
    protected $_encodeMethod = array('', '');

    /**
     * Is the browser an IE version earlier than 6 SP2?
     */
    protected static function _isBuggyIe()
    {
        $ua = $_SERVER['HTTP_USER_AGENT'];
        // quick escape for non-IEs
        if (0 !== strpos($ua, 'Mozilla/4.0 (compatible; MSIE ')
            || false !== strpos($ua, 'Opera')) {
            return false;
        }
        // no regex = faaast
        $version = (float)substr($ua, 30);
        return self::$encodeToIe6
            ? ($version < 6 || ($version == 6 && false === strpos($ua, 'SV1')))
            : ($version < 7);
    }
}


code:
<?php
/**
 * jsmin.php - PHP implementation of Douglas Crockford's JSMin.
 *
 * This is a direct port of jsmin.c to PHP with a few PHP performance tweaks and
 * modifications to preserve some comments (see below). Also, rather than using
 * stdin/stdout, JSMin::minify() accepts a string as input and returns another
 * string as output.
 *
 * Comments containing IE conditional compilation are preserved, as are multi-line
 * comments that begin with "/*!" (for documentation purposes). In the latter case
 * newlines are inserted around the comment to enhance readability.
 *
 * PHP 5 or higher is required.
 *
 * Permission is hereby granted to use this version of the library under the
 * same terms as jsmin.c, which has the following license:
 *
 * --
 * Copyright (c) 2002 Douglas Crockford  (www.crockford.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * The Software shall be used for Good, not Evil.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * --
 *
 * @package JSMin
 * @author Ryan Grove <ryan@wonko.com> (PHP port)
 * @author Steve Clay <steve@mrclay.org> (modifications + cleanup)
 * @author Andrea Giammarchi <http://www.3site.eu> (spaceBeforeRegExp)
 * @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c)
 * @copyright 2008 Ryan Grove <ryan@wonko.com> (PHP port)
 * @license http://opensource.org/licenses/mit-license.php MIT License
 * @link http://code.google.com/p/jsmin-php/
 */

class JSMin {
    const ORD_LF            = 10;
    const ORD_SPACE         = 32;
    const ACTION_KEEP_A     = 1;
    const ACTION_DELETE_A   = 2;
    const ACTION_DELETE_A_B = 3;

    protected $a           = "\n";
    protected $b           = '';
    protected $input       = '';
    protected $inputIndex  = 0;
    protected $inputLength = 0;
    protected $lookAhead   = null;
    protected $output      = '';

    /**
     * Minify Javascript
     *
     * @param string $js Javascript to be minified
     * @return string
     */
    public static function minify($js)
    {
        $jsmin = new JSMin($js);
        return $jsmin->min();
    }

    /**
     * Setup process
     */
    public function __construct($input)
    {
        $this->input       = str_replace("\r\n", "\n", $input);
        $this->inputLength = strlen($this->input);
    }

    /**
     * Perform minification, return result
     */
    public function min()
    {
        if ($this->output !== '') { // min already run
            return $this->output;
        }
        $this->action(self::ACTION_DELETE_A_B);

        while ($this->a !== null) {
            // determine next command
            $command = self::ACTION_KEEP_A; // default
            if ($this->a === ' ') {
                if (! $this->isAlphaNum($this->b)) {
                    $command = self::ACTION_DELETE_A;
                }
            } elseif ($this->a === "\n") {
                if ($this->b === ' ') {
                    $command = self::ACTION_DELETE_A_B;
                } elseif (false === strpos('{[(+-', $this->b)
                          && ! $this->isAlphaNum($this->b)) {
                    $command = self::ACTION_DELETE_A;
                }
            } elseif (! $this->isAlphaNum($this->a)) {
                if ($this->b === ' '
                    || ($this->b === "\n"
                        && (false === strpos('}])+-"\'', $this->a)))) {
                    $command = self::ACTION_DELETE_A_B;
                }
            }
            $this->action($command);
        }
        $this->output = trim($this->output);
        return $this->output;
    }

    /**
     * ACTION_KEEP_A = Output A. Copy B to A. Get the next B.
     * ACTION_DELETE_A = Copy B to A. Get the next B.
     * ACTION_DELETE_A_B = Get the next B.
     */
    protected function action($command)
    {
        switch ($command) {
            case self::ACTION_KEEP_A:
                $this->output .= $this->a;
                // fallthrough
            case self::ACTION_DELETE_A:
                $this->a = $this->b;
                if ($this->a === "'" || $this->a === '"') { // string literal
                    $str = $this->a; // in case needed for exception
                    while (true) {
                        $this->output .= $this->a;
                        $this->a       = $this->get();
                        if ($this->a === $this->b) { // end quote
                            break;
                        }
                        if (ord($this->a) <= self::ORD_LF) {
                            throw new JSMin_UnterminatedStringException(
                                'Unterminated String: ' . var_export($str, true));
                        }
                        $str .= $this->a;
                        if ($this->a === '\\') {
                            $this->output .= $this->a;
                            $this->a       = $this->get();
                            $str .= $this->a;
                        }
                    }
                }
                // fallthrough
            case self::ACTION_DELETE_A_B:
                $this->b = $this->next();
                if ($this->b === '/' && $this->isRegexpLiteral()) { // RegExp literal
                    $this->output .= $this->a . $this->b;
                    $pattern = '/'; // in case needed for exception
                    while (true) {
                        $this->a = $this->get();
                        $pattern .= $this->a;
                        if ($this->a === '/') { // end pattern
                            break; // while (true)
                        } elseif ($this->a === '\\') {
                            $this->output .= $this->a;
                            $this->a       = $this->get();
                            $pattern      .= $this->a;
                        } elseif (ord($this->a) <= self::ORD_LF) {
                            throw new JSMin_UnterminatedRegExpException(
                                'Unterminated RegExp: '. var_export($pattern, true));
                        }
                        $this->output .= $this->a;
                    }
                    $this->b = $this->next();
                }
            // end case ACTION_DELETE_A_B
        }
    }

    protected function isRegexpLiteral()
    {
        if (false !== strpos("\n{;(,=:[!&|?", $this->a)) { // we aren't dividing
            return true;
        }
        if (' ' === $this->a) {
            $length = strlen($this->output);
            if ($length < 2) { // weird edge case
                return true;
            }
            // you can't divide a keyword
            if (preg_match('/(?:case|else|in|return|typeof)$/', $this->output, $m)) {
                if ($this->output === $m[0]) { // odd but could happen
                    return true;
                }
                // make sure it's a keyword, not end of an identifier
                $charBeforeKeyword = substr($this->output, $length - strlen($m[0]) - 1, 1);
                if (! $this->isAlphaNum($charBeforeKeyword)) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * Get next char. Convert ctrl char to space.
     */
    protected function get()
    {
        $c = $this->lookAhead;
        $this->lookAhead = null;
        if ($c === null) {
            if ($this->inputIndex < $this->inputLength) {
                $c = $this->input[$this->inputIndex];
                $this->inputIndex += 1;
            } else {
                return null;
            }
        }
        if ($c === "\r" || $c === "\n") {
            return "\n";
        }
        if (ord($c) < self::ORD_SPACE) { // control char
            return ' ';
        }
        return $c;
    }

    /**
     * Get next char. If is ctrl character, translate to a space or newline.
     */
    protected function peek()
    {
        $this->lookAhead = $this->get();
        return $this->lookAhead;
    }

    /**
     * Is $c a letter, digit, underscore, dollar sign, escape, or non-ASCII?
     */
    protected function isAlphaNum($c)
    {
        return (preg_match('/^[0-9a-zA-Z_\\$\\\\]$/', $c) || ord($c) > 126);
    }

    protected function singleLineComment()
    {
        $comment = '';
        while (true) {
            $get = $this->get();
            $comment .= $get;
            if (ord($get) <= self::ORD_LF) { // EOL reached
                // if IE conditional comment
                if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
                    return "/{$comment}";
                }
                return $get;
            }
        }
    }

    protected function multipleLineComment()
    {
        $this->get();
        $comment = '';
        while (true) {
            $get = $this->get();
            if ($get === '*') {
                if ($this->peek() === '/') { // end of comment reached
                    $this->get();
                    // if comment preserved by YUI Compressor
                    if (0 === strpos($comment, '!')) {
                        return "\n/*" . substr($comment, 1) . "*/\n";
                    }
                    // if IE conditional comment
                    if (preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
                        return "/*{$comment}*/";
                    }
                    return ' ';
                }
            } elseif ($get === null) {
                throw new JSMin_UnterminatedCommentException('Unterminated Comment: ' . var_export('/*' . $comment, true));
            }
            $comment .= $get;
        }
    }

    /**
     * Get the next character, skipping over comments.
     * Some comments may be preserved.
     */
    protected function next()
    {
        $get = $this->get();
        if ($get !== '/') {
            return $get;
        }
        switch ($this->peek()) {
            case '/': return $this->singleLineComment();
            case '*': return $this->multipleLineComment();
            default: return $get;
        }
    }
}

class JSMin_UnterminatedStringException extends Exception {}
class JSMin_UnterminatedCommentException extends Exception {}
class JSMin_UnterminatedRegExpException extends Exception {}