3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f(&$x) {echo $x;} $x = 1; f(@array(1, 2)); echo $x;
Output for 8.3.0 - 8.3.4
Fatal error: Uncaught Error: f(): Argument #1 ($x) could not be passed by reference in /in/r1SD2:4 Stack trace: #0 {main} thrown in /in/r1SD2 on line 4
Process exited with code 255.
Output for 8.1.23 - 8.1.27, 8.2.10 - 8.2.17
Fatal error: Uncaught Error: f(): Argument #1 ($x) cannot be passed by reference in /in/r1SD2:4 Stack trace: #0 {main} thrown in /in/r1SD2 on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.21
Fatal error: Only variables can be passed by reference in /in/r1SD2 on line 4
Process exited with code 255.

preferences:
84.33 ms | 401 KiB | 73 Q