note 126060 added to language.operators.type

if you have only class names (not objects) you can use that snippet: https://3v4l.org/mUKUC <?php interface i{} class a implements i{} var_dump(a::class instanceof i); // false var_dump(in_array(i::class, class_implements(a::class), true)); // true ---- Server IP: 45.112.84.4 Probable Submitter: 45.112.85.242 (proxied: 37.214.46.78) ---- Manual Page -- https://php.net/manual/en/language.operators.type.php Edit -- https://main.php.net/note/edit/126060 Del: integrated -- https://main.php.net/note/delete/126060/integrated Del: useless -- https://main.php.net/note/delete/126060/useless Del: bad code -- https://main.php.net/note/delete/126060/bad+code Del: spam -- https://main.php.net/note/delete/126060/spam Del: non-english -- https://main.php.net/note/delete/126060/non-english Del: in docs -- https://main.php.net/note/delete/126060/in+docs Del: other reasons-- https://main.php.net/note/delete/126060 Reject -- https://main.php.net/note/reject/126060 Search -- https://main.php.net/manage/user-notes.php