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run code in 150+ php & hhvm versions
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<?php $a = array(1,2,3,3,4,4,4,4,4,5,80,1,1); var_dump(array_unique($a));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [4]=> int(4) [9]=> int(5) [10]=> int(80) }