3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $array=array(1,1,2,2,3,3,4,4,5,5,6,6,1,1,2,3,4,5); $unique = array_keys(array_flip($array)); var_dump($unique); ?>
Output for 4.3.0 - 7.1.0
array(6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) }