3v4l.org

run code in 300+ PHP versions simultaneously
<?php function lala($a = false) { var_dump($a); } lala(); lala(true); lala(null); lala('qweqwe');
Output for 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
bool(false) bool(true) NULL string(6) "qweqwe"
preferences:
128.95 ms | 404 KiB | 174 Q