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<?php $a = [3 => ['a' => 'a1'], 4 => ['a' => 'a2']]; $b = [3 => ['b' => 'b1'], 4 => ['b' => 'b2']]; var_dump(array_merge($a, $b));
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> array(1) { ["a"]=> string(2) "a1" } [1]=> array(1) { ["a"]=> string(2) "a2" } [2]=> array(1) { ["b"]=> string(2) "b1" } [3]=> array(1) { ["b"]=> string(2) "b2" } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/NFDNd 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/NFDNd on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/NFDNd on line 3
Process exited with code 255.