3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('photo' => 'foo.jpeg', 'audio' => 'bar.mp3'); $b = array('photo', 'audio', 'video'); var_dump(array_values(array_merge(array_diff($b, $a), array_diff($a, $b))));
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(5) { [0]=> string(5) "photo" [1]=> string(5) "audio" [2]=> string(5) "video" [3]=> string(8) "foo.jpeg" [4]=> string(7) "bar.mp3" }

preferences:
154.95 ms | 404 KiB | 179 Q