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<?php $str="prijs=0,209&orderby=price&order=undefined&posts_per_page=undefined"; $repl=['/=/', '/,/', '/&/']; $with=['[[', '],[', ']],[']; $str='[' . preg_replace($repl, $with, $str) . ']'; var_dump($str);
Output for git.master, git.master_jit, rfc.property-hooks
string(83) "[prijs[[0],[209]],[orderby[[price]],[order[[undefined]],[posts_per_page[[undefined]"

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