note 110507 deleted from internals2.opcodes.instanceof by aharvey

Note Submitter: carloagonzales at gmail dot com ---- When checking if the an object of an unknown type is an instance of the class within its implementation and using magic constant __CLASS__ make sure to put the value of __CLASS__ to a variable first, before using instanceof. <?php /** * RIGHT WAY to determine class instance in a class method */ class TestClass { //static or what ever you prefer static function isClassInstance($variableWithUnknownClass){ return $variableWithUnknownClass instanceof __CLASS__; } } //Returns TRUE $object = new TestClass(); var_dump(TestClass::isClassInstance($object)); //Returns FALSE $object = new stdClass(); var_dump(TestClass::isClassInstance($object)); /** * WRONG WAY to determine class instance in a class method * RESULTS to a FATAL ERROR */ class TestClass { //static or what ever you prefer static function isClassInstance($variableWithUnknownClass){ return $variableWithUnknownClass instanceof __CLASS__; } } ?>