- urldecode: documentation ( source)
<?php
echo urldecode("user%5Bname%5D=ege&user%5Bsurname%5D=sercetin&user%5Bemail%5D=ege%40sertcetin.com&user%5Bphone%5D=5362238422&user%5Baddress%5D=Kasatura+sok.+Yola%C3%A7t%C4%B1+Binas%C4%B1.+42+Numaradan+ilk+sol.&user%5Bcountry%5D=T%C3%BCrkiye&user%5Bcity%5D=%C4%B0stanbul");