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run code in 150+ php & hhvm versions
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<?php $s = "Sticky_Sticky_Sticky_Sticky_Sticky_"; $r = array_unique(explode("_", $s)); foreach($r as $q) { echo $q . '<br />'; } ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Sticky<br /><br />