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run code in 150+ php & hhvm versions
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<?php $a = "elements[0][1]"; parse_str($a, $data); print_r($data);
Output for 4.3.0 - 5.1.2, 5.1.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [elements] => Array ( [0] => Array ( [1] => ) ) )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.3
Array ( [elements] => Array ( [0] => Array ( [1] => ) ) [_] => )