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<?php $array = array_push(array(),7); echo $array[0];
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught Error: array_push(): Argument #1 ($array) could not be passed by reference in /in/NQjR8:3 Stack trace: #0 {main} thrown in /in/NQjR8 on line 3
Process exited with code 255.
Output for 8.1.23 - 8.1.28, 8.2.10 - 8.2.18
Fatal error: Uncaught Error: array_push(): Argument #1 ($array) cannot be passed by reference in /in/NQjR8:3 Stack trace: #0 {main} thrown in /in/NQjR8 on line 3
Process exited with code 255.
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.20
Fatal error: Only variables can be passed by reference in /in/NQjR8 on line 3
Process exited with code 255.

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