note 75871 added to language.operators.type

Unfortunately the instanceof operator will not accept a string as its first operand. So I wrote this function. It does exactly the same (ie, successively checks identicalness, inheritance and implementation). Just on strings. <?php function is_instance_of($sub, $super) { $sub = (string)$sub; $super = is_object($super) ? get_class($super) : (string)$super; switch(true) { case $sub === $super; // well ... conformity case is_subclass_of($sub, $super): case in_array($super, class_implements($sub)): return true; default: return false; } } // testing interface X {} class A {} class B extends A {} class C extends B {} class D implements X {} $i = 'is_instance_of'; var_dump($i('A', 'A'), $i('B', 'A'), $i('C', 'A'), $i('D', 'X')); ?> ---- Server IP: 195.136.184.34 Probable Submitter: 83.31.205.27 ---- Manual Page -- http://www.php.net/manual/en/language.operators.type.php Edit -- https://master.php.net/note/edit/75871 Del: integrated -- https://master.php.net/note/delete/75871/integrated Del: useless -- https://master.php.net/note/delete/75871/useless Del: bad code -- https://master.php.net/note/delete/75871/bad+code Del: spam -- https://master.php.net/note/delete/75871/spam Del: non-english -- https://master.php.net/note/delete/75871/non-english Del: in docs -- https://master.php.net/note/delete/75871/in+docs Del: other reasons-- https://master.php.net/note/delete/75871 Reject -- https://master.php.net/note/reject/75871 Search -- https://master.php.net/manage/user-notes.php