<?php function rotUrl($url) { return strtr($url, './-:?=&%# ZQXJKVWPY abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHILMNORSTU', 'ZQXJKVWPY ./-:?=&%# 123456789ABCDEFGHILMNORSTUabcdefghijklmnopqrstuvwxyz'); } assert('http://google.com' === rotUrl(rotUrl('http://google.com')));
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