3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 1; $b = null; function test ($a, $b, $b) {}
Output for 7.0.0 - 7.0.1
Fatal error: Redefinition of parameter $b in /in/TJJ5G on line 6
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
preferences:
168.04 ms | 1395 KiB | 36 Q