3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo() { return array(1, 2, 3); } var_dump(array_pop(array(1, 2, 3))); var_dump(array_pop(foo()));
Output for 8.3.0 - 8.3.7
Fatal error: Uncaught Error: array_pop(): Argument #1 ($array) could not be passed by reference in /in/CGO6q:5 Stack trace: #0 {main} thrown in /in/CGO6q on line 5
Process exited with code 255.
Output for 8.1.23 - 8.1.28, 8.2.10 - 8.2.18
Fatal error: Uncaught Error: array_pop(): Argument #1 ($array) cannot be passed by reference in /in/CGO6q:5 Stack trace: #0 {main} thrown in /in/CGO6q on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.34
Fatal error: Only variables can be passed by reference in /in/CGO6q on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Only variables can be passed by reference in /in/CGO6q on line 5
preferences:
129.71 ms | 401 KiB | 145 Q