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<?php var_dump( array_diff_key( ['a' => 'x', 'b' => 'y', 'c' =>'z'], ['d' => 'v', 'b' => 'w', 'm' => 'n'] ) );
based on VQVKT
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(2) { ["a"]=> string(1) "x" ["c"]=> string(1) "z" }