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<?php $a1 = ['test' => [1 => 'first'], ['val']]; $a2 = ['test' => [2 => 'second'], ['val2']]; $a3 = $a1 + $a2; var_dump($a3);
based on A8YRq
Output for 5.4.0 - 7.3.0rc4
array(2) { ["test"]=> array(1) { [1]=> string(5) "first" } [0]=> array(1) { [0]=> string(3) "val" } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/hdLbZ 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/hdLbZ on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/hdLbZ on line 3
Process exited with code 255.