Online PHP editor | output for 8lG3v

<?php $array1 = array('field1' => 'toast', 'field2' => 'butter'); $array2 = array('field1' => 'toast', 'field2' => 'margerine', 'field3' => 'tea'); $keys = array(); print_r(array_diff_key($array1, $array2)); foreach($array2 as $key=>$value) { $t = 0; foreach($array1 as $key2=>$value2) { if($value == $value2) { $t++; } } if($t==0) array_push($keys, $key) } print_r($keys);