query: Notice: Undefined index: $username
positive_passages.docid: 2005
positive_passages.text: "Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset" using PHP
negative_passages.docid: 86214
negative_passages.text: if(!isset($_POST["user"]) ignored and returns Undefined Index
negative_passages.docid: 1238
negative_passages.text: mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc... expects parameter 1 to be resource
negative_passages.docid: 49072
negative_passages.text: php login script Undefined variable: _session script
negative_passages.docid: 5190
negative_passages.text: "id cannot be resolved or is not a field" error?
negative_passages.docid: 35623
negative_passages.text: Created a new user at Stack Exchange, but did not get the right username
negative_passages.docid: 63241
negative_passages.text: Unable to use user fields from the global variable $user
negative_passages.docid: 30915
negative_passages.text: PHP Warning: Invalid argument supplied for foreach()
negative_passages.docid: 157148
negative_passages.text: What are the valid characters in PHP variable, method, class, etc names?
negative_passages.docid: 11030
negative_passages.text: mysqli_fetch_assoc() expects parameter / Call to a member function bind_param() errors. How to get the actual mysql error and fix it?
negative_passages.docid: 113181
negative_passages.text: Customize the Duplicate Username error message in a Community
negative_passages.docid: 114622
negative_passages.text: Call to undefined function session_register()
negative_passages.docid: 34830
negative_passages.text: PHP expects T_PAAMAYIM_NEKUDOTAYIM?
negative_passages.docid: 58038
negative_passages.text: Unknown modifier '/' error in PHP
negative_passages.docid: 19693
negative_passages.text: MySQL command appends '@localhost' to username
negative_passages.docid: 27136
negative_passages.text: Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?
negative_passages.docid: 81279
negative_passages.text: When to use global $post and other global variables?