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<?php $values = array(); parse_str('prijs[]=0&prijs[]=209&orderby=price&order=undefined&posts_per_page=undefined', $values); var_dump($values);
Output for 4.3.0 - 7.1.0
array(4) { ["prijs"]=> array(2) { [0]=> string(1) "0" [1]=> string(3) "209" } ["orderby"]=> string(5) "price" ["order"]=> string(9) "undefined" ["posts_per_page"]=> string(9) "undefined" }