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<?php $arrays = []; var_dump(array_merge(...$arrays));
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
array(0) { }
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Warning: array_merge() expects at least 1 parameter, 0 given in /in/nUEs7 on line 5 NULL

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