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run code in 150+ php & hhvm versions
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<?php class query_parser { function __construct($query_string) { print $query_string; } } $qp = new query_parser('filter={age_group:[1,2,3]}'); ?>
Output for 5.0.0 - 7.1.0
filter={age_group:[1,2,3]}
Output for 4.3.0 - 4.4.9