<?php return $k == 'b'; }, ARRAY_FILTER_USE_KEY));
Standard input is empty
NULL
PHP Notice: Use of undefined constant ARRAY_FILTER_USE_KEY - assumed 'ARRAY_FILTER_USE_KEY' in /home/pIHcPL/prog.php on line 7 PHP Warning: array_filter() expects at most 2 parameters, 3 given in /home/pIHcPL/prog.php on line 7