3v4l.org

run code in 300+ PHP versions simultaneously
<?php $A = ["key 1"=>"val 1", "key 2"=>"val 2", "key 3"=>"val 3"]; $B = ["key 2"=>"val 2"]; foreach($A as $key=>$val) { $myval = array_key_exists($key,$B) ? $B[$key] : 0; } var_dump($B);
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array(1) { ["key 2"]=> string(5) "val 2" }

preferences:
57.79 ms | 406 KiB | 5 Q