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run code in 150+ php & hhvm versions
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<?php $requiredAttibutes = array('email', 'id', 'first_name', 'last_name', 'whereru?'); $vals = array('email' => 1, 'id' => 2, 'first_name' => 3, 'last_name' => 4, 'lolmore' => 5); var_dump(array_diff_key(array_flip($requiredAttibutes), $vals));
based on 6GQBF
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { ["whereru?"]=> int(4) }
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/Rkg8h on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_diff_key() in /in/Rkg8h on line 7
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_diff_key() in /in/Rkg8h on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_diff_key() in /in/Rkg8h on line 7