3v4l.org

run code in 300+ PHP versions simultaneously
<?php if (!isset($array['key'])) { $array['key'] = 1; }
Output for 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
preferences:
44.5 ms | 407 KiB | 5 Q