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