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run code in 150+ php & hhvm versions
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<?php $a=array(0=>"red",1=>"green"); array_unshift($a,"blue"); print_r($a); ?>
based on jNmGX
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => blue [1] => red [2] => green )
Output for hhvm-3.10.0

Process exited with code 153.