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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) { $f[] = preg_split('/[=]/' , $a[0]); $f[$a[0]][] = preg_split('/[,]/' , $a[1]); } var_dump($f);
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(6) { [0]=> array(1) { [0]=> string(1) "p" } ["p"]=> array(2) { [0]=> array(1) { [0]=> string(1) "r" } [1]=> array(1) { [0]=> string(1) "o" } } [1]=> array(1) { [0]=> string(1) "o" } ["o"]=> array(2) { [0]=> array(1) { [0]=> string(1) "r" } [1]=> array(1) { [0]=> string(1) "r" } } [2]=> array(1) { [0]=> string(1) "o" } [3]=> array(1) { [0]=> string(1) "p" } }