3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Foo { const BAR = 20; } namespace { var_dump(\foo\BAR); var_dump(\Foo\BAR); }
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
int(20) int(20)
preferences:
63.25 ms | 406 KiB | 5 Q