3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo() {} function foo() {}
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.28, 5.5.0 - 5.5.12
Fatal error: Cannot redeclare foo() (previously declared in /in/5lNP6:2) in /in/5lNP6 on line 3
Process exited with code 255.
preferences:
181.43 ms | 1395 KiB | 78 Q