Online PHP editor | refs for GMgSB

<?php function compare($a, $b) { $ret = value_compare_func($a, $b); echo "value_compare_func($a, $b) == $ret\n"; return $ret; } function value_compare_func($a, $b){ if ($a === 'n_3') { return 0; } return strcmp($a, $b); } $array1 = array("n_1", "n_2", "n_3", "n_4" ); $array2 = array("green"); $result = array_udiff($array1, $array2, "compare"); print_r($result);