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run code in 200+ php & hhvm versions
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<?php var_dump(array_unique(array(1,2,3,3,2,1,5,4)));
Output for 4.3.0 - 7.2.0
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [6]=> int(5) [7]=> int(4) }