3v4l.org

run code in 500+ PHP versions simultaneously
<?php namespace Foo { const BAR = 20; } namespace { var_dump(\foo\BAR); var_dump(\Foo\BAR); }
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
int(20) int(20)
preferences:
68.17 ms | 1010 KiB | 4 Q