note 129705 added to function.array-diff

Looks like when one of the given arrays is multidimensional this will throw a warning: PHP Warning: Array to string conversion in Command line code on line 1 Sharing here, because it was not obvious for me from the error nor the documentation in this page. Code: <?php php -r 'array_diff(["a" => 1], ["b" => [ 1 ]]);' ?> Result: PHP Warning: Array to string conversion in Command line code on line 1 Warning: Array to string conversion in Command line code on line 1 ---- Server IP: 45.112.84.4 Probable Submitter: 80.90.5.137 (proxied: 2a0c:5a84:8201:a900:6d9b:813a:5db0:d2f2) ---- Manual Page -- https://php.net/manual/en/function.array-diff.php Edit -- https://main.php.net/note/edit/129705 Del: integrated -- https://main.php.net/note/delete/129705/integrated Del: useless -- https://main.php.net/note/delete/129705/useless Del: bad code -- https://main.php.net/note/delete/129705/bad+code Del: spam -- https://main.php.net/note/delete/129705/spam Del: non-english -- https://main.php.net/note/delete/129705/non-english Del: in docs -- https://main.php.net/note/delete/129705/in+docs Del: other reasons-- https://main.php.net/note/delete/129705 Reject -- https://main.php.net/note/reject/129705 Search -- https://main.php.net/manage/user-notes.php