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<?php $x = null; $y = array_merge(array('a'=>2, 'b'=>4, 'c'=>6), $x); var_dump($y);
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 #2 must be of type array, null given in /in/aAUGW:3 Stack trace: #0 /in/aAUGW(3): array_merge(Array, NULL) #1 {main} thrown in /in/aAUGW on line 3
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: array_merge(): Expected parameter 2 to be an array, null given in /in/aAUGW on line 3 NULL
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33
Warning: array_merge(): Argument #2 is not an array in /in/aAUGW on line 3 NULL
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
array(3) { ["a"]=> int(2) ["b"]=> int(4) ["c"]=> int(6) }

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