3v4l.org

run code in 300+ PHP versions simultaneously
<?php function a(&$a) { $a++; } function g() { return new DateTime; } a(DateTime::ATOM);
Output for 8.3.0 - 8.3.4
Fatal error: Uncaught Error: a(): Argument #1 ($a) could not be passed by reference in /in/pFKjF:9 Stack trace: #0 {main} thrown in /in/pFKjF on line 9
Process exited with code 255.
Output for 8.1.23 - 8.1.27, 8.2.10 - 8.2.17
Fatal error: Uncaught Error: a(): Argument #1 ($a) cannot be passed by reference in /in/pFKjF:9 Stack trace: #0 {main} thrown in /in/pFKjF on line 9
Process exited with code 255.
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.24
Fatal error: Only variables can be passed by reference in /in/pFKjF on line 9
Process exited with code 255.

preferences:
87.01 ms | 401 KiB | 77 Q