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<?php mb_parse_str('foo[]=bar&foo[]=baz&abc=123', $out); var_dump($out);
Output for 5.3.18 - 7.2.0
array(2) { ["foo"]=> array(2) { [0]=> string(3) "bar" [1]=> string(3) "baz" } ["abc"]=> string(3) "123" }