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run code in 200+ php & hhvm versions
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<?php $a=array("red","green"); array_push($a,"blue","yellow"); print_r($a); ?>
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
Array ( [0] => red [1] => green [2] => blue [3] => yellow )