note 99549 added to language.references.pass

Someone mentioned that passing reference doesn't work as expected from within call_user_func(). For example: $string = 'string'; function change(&$str) { $str = 'str'; } call_user_func('change', $string); echo $string; output: string //not as expected 'str' Here we could assume call_user_func as below function call_user_funct($func, $param) { $func($param); } As calling $func() inside call_user_funct, here is change(), the variable $param is copied to a third variable then the temp variable is passed to the $func. So $str only hold the reference of the temp variable inside change(). Of course , if we pass &$string directly to call_user_func we could always get the result as expected (str). ---- Server IP: 61.195.146.164 Probable Submitter: 126.112.211.154 ---- Manual Page -- http://www.php.net/manual/en/language.references.pass.php Edit -- https://master.php.net/note/edit/99549 Del: integrated -- https://master.php.net/note/delete/99549/integrated Del: useless -- https://master.php.net/note/delete/99549/useless Del: bad code -- https://master.php.net/note/delete/99549/bad+code Del: spam -- https://master.php.net/note/delete/99549/spam Del: non-english -- https://master.php.net/note/delete/99549/non-english Del: in docs -- https://master.php.net/note/delete/99549/in+docs Del: other reasons-- https://master.php.net/note/delete/99549 Reject -- https://master.php.net/note/reject/99549 Search -- https://master.php.net/manage/user-notes.php