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<?php $first = [ 'abc' => [] ]; $alias = 'def'; var_dump(array_merge($first, [$alias => []]));
based on akSNo
Output for 5.4.0 - 7.2.0
array(2) { ["abc"]=> array(0) { } ["def"]=> array(0) { } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/pIEDN 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/pIEDN on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/pIEDN on line 3
Process exited with code 255.