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<?php $a = array(1 => 'Test', 2 => 'RT', 3 => 'ee'); var_dump(array_diff_key($a, array_flip(array(1,2))));
based on 4NCDm
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [3]=> string(2) "ee" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function array_diff_key() in /in/RLBlB on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_diff_key() in /in/RLBlB on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_diff_key() in /in/RLBlB on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_diff_key() in /in/RLBlB on line 4