Online PHP editor | refs for lFQUm

<?php $compare = function($a, $b) use(&$iteration_count) { // echo("$a : $b\n"); $iteration_count++; return strcmp($a, $b); }; $a = array('11', '21', '31', '41', '11'); $b = array('12', '22', '32', '42', '52', '11'); $iteration_count = 0; var_dump(array_udiff($a, $b, $compare)); var_dump($iteration_count); echo "\n\n"; $iteration_count = 0; $a_new = array_combine($a, array_fill(0, count($a), 1)); $b_new = array_combine($b, array_fill(0, count($b), 1)); var_dump(array_diff_uassoc($a_new, $b_new, $compare)); var_dump($iteration_count); echo "\n\n";