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<?php parse_str('.fo.o=.ba.r& ba%20z=q%20u x', $arr); $arr[' ab c'] = 'test'; var_dump($arr);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["_fo_o"]=> string(5) ".ba.r" ["ba_z"]=> string(5) "q u x" [" ab c"]=> string(4) "test" }