3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Foo; define('Foo\\true', false); if (true) { echo "TRUE"; } else { echo "FALSE!!!"; }
Output for 7.0.0 - 7.0.20, 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 - 8.2.18, 8.3.0 - 8.3.6
TRUE
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
FALSE!!!
preferences:
194.48 ms | 402 KiB | 226 Q