3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('KINT_MB', function_exists('mb_substr')); for ($i = 0; $i < 100000; $i++) { if (KINT_MB) { } }
Output for 7.3.24 - 7.3.33, 7.4.12 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
preferences:
144.21 ms | 403 KiB | 119 Q