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run code in 200+ php & hhvm versions
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<?php $l=[]; $l[]=1; $l[]=2; $l[]=3; var_dump($l);
Output for 5.6.30 - 5.6.38, hhvm-3.18.5 - 3.22.0, 7.0.28 - 7.3.0
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }