note 98365 added to function.is-callable

It seems the only issue left with is_callable() is the disable_functions ini-setting. Apart from that, is_callable() will reliably evaluate whether the passed function or method can be called from within the same context is_callable() was called from, taking visibility and inheritance into account. This includes functions, regular and static methods, magic functions and methods and implemented interfaces (which are regular methods within the implementing class anyway). <?php function regular_function() {} abstract class ParentTest { public function public_parent_method() {} protected function protected_parent_method() {} public static function static_method() {} protected static function protected_static_method() {} } class CallableTest extends ParentTest implements Countable { public function __invoke() { } // Introduced in 5.3, see http://php.net/manual/language.oop5.magic.php protected function protected_method() { } public function is_callable($args) { return is_callable($args); } // Countable public function count() { return 1; } } $o = new CallableTest(); // Regular function: var_dump(is_callable('regular_function')); // true // Magic __invoke method: var_dump(is_callable($o)); // true if PHP >= 5.3, false otherwise // Countable implementation (regular method really): var_dump(is_callable(array($o, 'count'))); // true // Protected method from outside the object's scope: var_dump(is_callable(array($o, 'protected_method'))); // false // Protected method from inside the object's scope via public proxy method: var_dump($o->is_callable(array($o, 'protected_method'))); // true // Parent's public method var_dump(is_callable(array($o, 'public_parent_method'))); // true // Parent's protected method var_dump(is_callable(array($o, 'protected_parent_method'))); // false // Parent's protected method via proxy var_dump($o->is_callable(array($o, 'protected_parent_method'))); // true // Parent's static public method var_dump(is_callable('CallableTest::static_method')); // true // Parent's static protected method var_dump(is_callable('CallableTest::protected_static_method')); // false // Parent's static protected method via proxy var_dump($o->is_callable('CallableTest::protected_static_method')); // true ?> Tested PHP versions were 5.2.9 on openSUSE 10.3 (x64) and 5.3.1 on Windows Server 2003 (x86). ---- Server IP: 69.147.83.197 Probable Submitter: 85.127.111.98 ---- Manual Page -- http://www.php.net/manual/en/function.is-callable.php Edit -- https://master.php.net/note/edit/98365 Del: integrated -- https://master.php.net/note/delete/98365/integrated Del: useless -- https://master.php.net/note/delete/98365/useless Del: bad code -- https://master.php.net/note/delete/98365/bad+code Del: spam -- https://master.php.net/note/delete/98365/spam Del: non-english -- https://master.php.net/note/delete/98365/non-english Del: in docs -- https://master.php.net/note/delete/98365/in+docs Del: other reasons-- https://master.php.net/note/delete/98365 Reject -- https://master.php.net/note/reject/98365 Search -- https://master.php.net/manage/user-notes.php