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<?php var_dump(array_intersect(array('1','2','3','test','voila'), array('test','1',2,'4'))); ?>
Output for 4.3.0 - 5.6.22, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(1) "1" [1]=> string(1) "2" [3]=> string(4) "test" }