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run code in 150+ php & hhvm versions
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<?php print_r( array_unique(array_merge(array(1,2,3), array(2,3,4))));
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 2 [2] => 3 [5] => 4 )