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<?php $a = null; $b = null; array_merge($a, $b);
Output for 8.0.22 - 8.0.30, 8.1.34, 8.2.30, 8.3.5 - 8.3.30, 8.4.9 - 8.4.18, 8.5.0 - 8.5.3
Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/OWtO5:6 Stack trace: #0 /in/OWtO5(6): array_merge(NULL, NULL) #1 {main} thrown in /in/OWtO5 on line 6
Process exited with code 255.
Output for 7.4.33
Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/OWtO5 on line 6

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