3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array1 = array("a" => array(1)); $array2 = array("b" => array("1")); $a = array("1" => 1, "2" => 1, "3" => 1, "4" => 1); $b = array("2" => 1, "4" => 1, "5" => 1, "6" => 1); $c = array(1,2,3,4); $d = array(2,4); //$result2 = array_intersect_key($a, $b); // 2 4 $result3 = array_intersect($c,$d); print_r($result2); print_r($result3); ?>

preferences:
58.49 ms | 402 KiB | 5 Q