replaced is_null($foo->$bar()) with $foo->$bar() === null
replaced is_null($foo->$bar()) with $foo->$bar() === null

adamlundrigan/zend-stdlib,php-refactoring/zend-array-utility,ezimuel/zend-stdlib,MadCat34/zend-stdlib,weierophinney/zend-stdlib,akrabat/zend-stdlib,sravanchandj/zend-stdlib