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<?php var_dump(array_diff(array('1' => 3, '2' => 4677, 7, 6), array('2', '46772', '599233', '6')));
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.17.3, 7.0.0 - 7.2.0
array(3) { [1]=> int(3) [2]=> int(4677) [3]=> int(7) }
Output for hhvm-3.12.14

Process exited with code 137.