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run code in 150+ php & hhvm versions
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<?php $a1 = array(1,3,5,6); $a2 = array(2,4,6,7); print_r(array_intersect($a1, $a2));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [3] => 6 )