3v4l.org

run code in 300+ PHP versions simultaneously
<?php function myfunction(&$myvalue = null) { echo $myvalue; } myfunction("ok");
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught Error: myfunction(): Argument #1 ($myvalue) could not be passed by reference in /in/X2oHX:6 Stack trace: #0 {main} thrown in /in/X2oHX on line 6
Process exited with code 255.
Output for 8.1.23 - 8.1.28, 8.2.10 - 8.2.18
Fatal error: Uncaught Error: myfunction(): Argument #1 ($myvalue) cannot be passed by reference in /in/X2oHX:6 Stack trace: #0 {main} thrown in /in/X2oHX on line 6
Process exited with code 255.
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.30
Fatal error: Only variables can be passed by reference in /in/X2oHX on line 6
Process exited with code 255.

preferences:
84.78 ms | 402 KiB | 87 Q