3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array( 1 => array(1,2,3, null, 1, null), 2 => array(1,null,3,null,null) ); $result=array_intersect_assoc(array_filter($arr[1]), array_filter($arr[2])); print_r($result);
Output for 7.1.25 - 7.1.28, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => 1 [2] => 3 )
preferences:
144.4 ms | 403 KiB | 163 Q