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<?php $capabilities = []; $capabilities['a'][] = 't1'; $capabilities['a'][] = 't2'; var_dump($capabilities); array_merge($capabilities,null);
Output for 8.0.1 - 8.0.26, 8.1.0 - 8.1.13, 8.2rc1 - rc3
array(1) { ["a"]=> array(2) { [0]=> string(2) "t1" [1]=> string(2) "t2" } } Fatal error: Uncaught TypeError: array_merge(): Argument #2 must be of type array, null given in /in/Q4v2j:8 Stack trace: #0 /in/Q4v2j(8): array_merge(Array, NULL) #1 {main} thrown in /in/Q4v2j on line 8
Process exited with code 255.
Output for 7.4.0 - 7.4.33
array(1) { ["a"]=> array(2) { [0]=> string(2) "t1" [1]=> string(2) "t2" } } Warning: array_merge(): Expected parameter 2 to be an array, null given in /in/Q4v2j on line 8

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