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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);

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46.83 ms | 402 KiB | 5 Q