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<?php $a = ['a'=>1,'b'=>2,'c'=>3]; $b = ['a'=>'aa','b'=>'bb']; var_dump(array_combine( array_map( function($key) use ($b) { return isset($b[$key]) ? $b[$key] : $key; }, array_keys($a) ), array_values($a) ));
Output for 5.4.0 - 7.1.0
array(3) { ["aa"]=> int(1) ["bb"]=> int(2) ["c"]=> int(3) }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/su5Uf 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/su5Uf on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/su5Uf on line 3
Process exited with code 255.