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run code in 150+ php & hhvm versions
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<?php $arr = array("Puppy", "Teaser", "Chase"); foreach($arr as $a) { if ($a == "Teaser") unset($a); } var_dump($arr); ?>
based on oP1C8
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(5) "Puppy" [1]=> string(6) "Teaser" [2]=> string(5) "Chase" }
Output for hhvm-3.10.0

Process exited with code 153.