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run code in 150+ php & hhvm versions
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<?php function merge() { return array_reduce(array_slice(func_get_args(), 1), 'array_merge', []); } var_dump(array_merge([1, 2, 3], [4, 5, 6], ['a' => 'b'], ['a' => 'c']), merge([1, 2, 3], [4, 5, 6], ['a' => 'b'], ['a' => 'c']));
based on EaEIr
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(7) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) ["a"]=> string(1) "c" } array(4) { [0]=> int(4) [1]=> int(5) [2]=> int(6) ["a"]=> string(1) "c" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/kCki6 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/kCki6 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/kCki6 on line 5
Process exited with code 255.