Online PHP editor | refs for gd6ND

<?php $array_1 = array("1a" =>"dogs","2a" => "cats","3a" => "birds","4a" => "people"); $array_2 = array("4a" => "walking","2a" => "cats"); foreach ($array_1 as $key_1 => $value_1) { if (array_key_exists($key_1, $array_2)) { $array_1[$key_1] = $array_2[$key_1]; } } print_r($array_1);