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<?php var_dump(parse_str('\x00', $data)); var_dump($data);
Output for 4.3.0 - 4.4.9, 5.4.0 - 7.2.0
NULL array(1) { ["\x00"]=> string(0) "" }
Output for 5.0.0 - 5.3.29
NULL array(1) { ["\\x00"]=> string(0) "" }