Online PHP editor | refs for 81g4P

<?php $array1 = ['keepThis', 'remove', 'keep', 'save', 'delete']; $array2 = ['hangOnto', 'remove', 'retain', 'keep', 'delete']; $clean1 = $array1; $clean2 = array_diff_ukey( $array2, $array1, function($a, $b) use (&$clean1, $array1, $array2) { if (isset($array2[$b]) && $array2[$b] === $array1[$b]) { unset($clean1[$b]); } return strcmp($array2[$a], $array1[$b]); } ); print_r($clean1); print_r($clean2);