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run code in 200+ php & hhvm versions
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<?php var_dump(urldecode('http%3A%2F%2Fwww.google.com')); var_dump(urldecode('http%253A%252F%252Fwww.google.com'));
based on UirTq
Output for 5.3.19 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.1
string(21) "http://www.google.com" string(27) "http%3A%2F%2Fwww.google.com"