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run code in 200+ php & hhvm versions
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<?php $array1 = [ 'a' => 'a', 'submodule_id' => [1] ]; $array2 = [ 'a' => 'a', 'submodule_id' => [1] ]; var_dump(array_merge_recursive($array1, $array2));
based on jY9mk
Output for 5.4.0 - 7.2.0
array(2) { ["a"]=> array(2) { [0]=> string(1) "a" [1]=> string(1) "a" } ["submodule_id"]=> array(2) { [0]=> int(1) [1]=> int(1) } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/lpPEQ on line 3
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/lpPEQ on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/lpPEQ on line 3
Process exited with code 255.