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run code in 150+ php & hhvm versions
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<?php $a[1]=array(1); var_dump($a);
based on OK1h1
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [1]=> array(1) { [0]=> int(1) } }