3v4l.org

run code in 300+ PHP versions simultaneously
<?php foo(); if (true) { function foo() {} }
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
Fatal error: Uncaught Error: Call to undefined function foo() in /in/YSpRN:3 Stack trace: #0 {main} thrown in /in/YSpRN on line 3
Process exited with code 255.

preferences:
33.26 ms | 410 KiB | 5 Q