3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 23; $a = array($a); print_r($a);
Output for 5.6.0 - 5.6.29, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
Array ( [0] => 23 )
preferences:
148.16 ms | 405 KiB | 198 Q