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<?php $foo = [ 0 => "test zero", 1 => "test one", 2 => "test two", 3 => "test three" ]; $bar = [ 1 => "test four", 5 => "test five", 3 => "test six", 4 => "test seven" ]; $result = array_diff_key($foo, $bar) + array_combine( $y = array_keys(array_intersect_key($foo, $bar)), array_map(function($x) use ($foo, $bar) { return $foo[$x]."\n".$bar[$x]; }, $y) ) + array_diff_key($bar, $foo); var_dump($result);
Output for 5.4.0 - 7.1.0
array(6) { [0]=> string(9) "test zero" [2]=> string(8) "test two" [1]=> string(18) "test one test four" [3]=> string(19) "test three test six" [5]=> string(9) "test five" [4]=> string(10) "test seven" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/uOeKS on line 2
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/uOeKS on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/uOeKS on line 2
Process exited with code 255.