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run code in 150+ php & hhvm versions
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<?php $arr[2250572483]=1; //dump the array var_dump($arr);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [2250572483]=> int(1) }
Output for hhvm-3.10.0

Process exited with code 153.