3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace igorw; define('igorw\\true', 'lolol'); define('igorw\\false', 'ohyeahhh'); var_dump( true, false );
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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 - 8.2.18, 8.3.0 - 8.3.6
bool(true) bool(false)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
string(5) "lolol" string(8) "ohyeahhh"
preferences:
188.74 ms | 402 KiB | 340 Q