note 104404 added to functions.arguments

This page states: "Note that when using default arguments, any defaults should be on the right side of any non-default arguments; otherwise, things will not work as expected." There seems to be one exception to this. Say you're using type-hinting for an argument, but you want to allow it to be NULL, and you want additional required arguments to the right of it. PHP allows this, as long as you give it the type-hinted argument a default value of NULL. For example: <?php function sample(ClassA $a = NULL, $b) { } sample(new ClassA(), ''); // success sample(new ClassB(), ''); // failure; wrong type sample(NULL, ''); // success sample(new ClassA()); // failure; missing second argument ?> ---- Server IP: 69.147.83.197 Probable Submitter: 24.6.209.102 ---- Manual Page -- http://www.php.net/manual/en/functions.arguments.php Edit -- https://master.php.net/note/edit/104404 Del: integrated -- https://master.php.net/note/delete/104404/integrated Del: useless -- https://master.php.net/note/delete/104404/useless Del: bad code -- https://master.php.net/note/delete/104404/bad+code Del: spam -- https://master.php.net/note/delete/104404/spam Del: non-english -- https://master.php.net/note/delete/104404/non-english Del: in docs -- https://master.php.net/note/delete/104404/in+docs Del: other reasons-- https://master.php.net/note/delete/104404 Reject -- https://master.php.net/note/reject/104404 Search -- https://master.php.net/manage/user-notes.php