- urldecode: documentation ( source)
<?php
echo urldecode('http://www.booking.com/searchresults.ru.html?checkin_monthday=23;checkin_year_month=2014-09;checkout_monthday=6;checkout_year_month=2014-10;dest_id=-3414440;dest_type=city;order=price_for_two;nflt=district%3D0%3Breview_score%3D80%3Bclass%3D3%3Bclass%3D4%3Bclass%3D5%3Bht_id%3D204%3B');