note 50276 added to language.oop5.typehinting

In case you're worried, type hinting does allow descendants. Extending the documentation example: <?php // Example class class MyClass { public function test(OtherClass $otherclass) { if(is_callable(array($otherclass,$otherclass->var))) { $otherclass->{$otherclass->var}(); } else { echo $otherclass->var; } } } // Another example class class OtherClass { public $var = 'Hello World'; } // Yet another example class class DerivedClass extends OtherClass { function __construct() { $this->var="Planet"; } public function Planet() { echo "Hello ".$this->var; } } $myclass = new MyClass; $otherclass = new OtherClass; $derivedclass = new DerivedClass; // Works - prints "Hello World" $myclass->test($otherclass); // Works - calls DerivedClass::Planet() // which prints "Hello Planet" $myclass->test($derivedclass); ?> ---- Manual Page -- http://www.php.net/manual/en/language.oop5.typehinting.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+50276 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+50276&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+50276&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+50276&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+50276&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+50276&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+50276&report=yes Search -- http://master.php.net/manage/user-notes.php