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run code in 200+ php & hhvm versions
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<?php $urlenc = '%41~%5b'; var_dump(rawurlencode(urldecode($urlenc)));
Output for 5.3.0 - 7.2.0
string(5) "A~%5B"
Output for 4.3.0 - 5.2.17
string(7) "A%7E%5B"