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<?php $var = array_push('foo', 'bar'); var_dump($var);
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught Error: array_push(): Argument #1 ($array) could not be passed by reference in /in/5Ha2c:3 Stack trace: #0 {main} thrown in /in/5Ha2c on line 3
Process exited with code 255.
Output for 8.1.23 - 8.1.28, 8.2.10 - 8.2.18
Fatal error: Uncaught Error: array_push(): Argument #1 ($array) cannot be passed by reference in /in/5Ha2c:3 Stack trace: #0 {main} thrown in /in/5Ha2c on line 3
Process exited with code 255.
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.23
Fatal error: Only variables can be passed by reference in /in/5Ha2c on line 3
Process exited with code 255.

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