3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "ab"; $b = "cd"; $c = $a . $b; strlen($c); str_pad($c, 2);
Output for 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
preferences:
174.81 ms | 403 KiB | 214 Q