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run code in 200+ php & hhvm versions
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<?php $x = urlencode('+ '); var_dump($x, rawurldecode($x), urldecode($x));
based on AGBjL
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
string(4) "%2B+" string(2) "++" string(2) "+ "