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@ 2015-04-30T05:24:52Z

<?php

$str = 'https://www.hwtrek.com/project/VscVjE%2FLOxM%3D';
$new_str = 'https://www.hwtrek.com/project/VscVjE%2FLOxM%3D';

do {
	$new_str = rawurldecode($new_str);
} while (preg_match('/%[0-9a-f]{2,}/i', $new_str));

echo $new_str, '\n', $str;

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
rawurldecode: documentation ( source)

preferences:dark modelive preview

52.09 ms | 402 KiB | 5 Q