3v4l.org

run code in 300+ PHP versions simultaneously
<?php $found = null; $people = array(3,20,2); $criminals = array( 2, 4, 8, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20); foreach($people as $num) { if (in_array($num,$criminals)) { $found[$num] = true; } } var_dump($found);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 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(2) { [20]=> bool(true) [2]=> bool(true) }
preferences:
260.58 ms | 404 KiB | 383 Q