3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Example; const false = true; var_dump(0 == false);
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.24
Fatal error: Cannot redeclare constant 'false' in /in/LhHTK on line 5
Process exited with code 255.
preferences:
184.52 ms | 1395 KiB | 61 Q