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run code in 150+ php & hhvm versions
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<?php $x = array('lol'=>array('mdr'=>'ptdr')); echo '$x:'; var_dump($x); echo '$x:'; var_dump($x);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
$x:array(1) { ["lol"]=> array(1) { ["mdr"]=> string(4) "ptdr" } } $x:array(1) { ["lol"]=> array(1) { ["mdr"]=> string(4) "ptdr" } }
Output for hhvm-3.10.0

Process exited with code 153.