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<?php $var = null; var_dump(array_merge($var, array('foobar')));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/AV03Z:4 Stack trace: #0 /in/AV03Z(4): array_merge(NULL, Array) #1 {main} thrown in /in/AV03Z on line 4
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/AV03Z on line 4 NULL
Output for 5.2.3 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Warning: array_merge(): Argument #1 is not an array in /in/AV03Z on line 4 NULL
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
<br /> <b>Warning</b>: array_merge() [<a href='function.array-merge'>function.array-merge</a>]: Argument #1 is not an array in <b>/in/AV03Z</b> on line <b>4</b><br /> NULL
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
array(1) { [0]=> string(6) "foobar" }

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309.45 ms | 402 KiB | 386 Q