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run code in 150+ php & hhvm versions
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<?php parse_str('a.b=c&d.e=f', $array); var_dump($array);
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["a_b"]=> string(1) "c" ["d_e"]=> string(1) "f" }