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run code in 150+ php & hhvm versions
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<?php $values = array(); parse_str('prijs=0,209&orderby=price&order=undefined&posts_per_page=undefined', $values); var_dump($values);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { ["prijs"]=> string(5) "0,209" ["orderby"]=> string(5) "price" ["order"]=> string(9) "undefined" ["posts_per_page"]=> string(9) "undefined" }
Output for hhvm-3.10.0

Process exited with code 153.