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<?php $str='prijs=0,209&orderby=price&order=undefined&posts_per_page=undefined'; parse_str($str, $values); var_dump($str); array_walk($str, function(&$n) { $n = explode(',', $n); }); var_dump($str);
Output for git.master, git.master_jit, rfc.property-hooks
string(66) "prijs=0,209&orderby=price&order=undefined&posts_per_page=undefined" Fatal error: Uncaught TypeError: array_walk(): Argument #1 ($array) must be of type array, string given in /in/qSWoj:6 Stack trace: #0 /in/qSWoj(6): array_walk('prijs=0,209&ord...', Object(Closure)) #1 {main} thrown in /in/qSWoj on line 6
Process exited with code 255.

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