- mb_convert_encoding: documentation ( source)
- urldecode: documentation ( source)
<?php
echo urldecode('%E4%EC%E8');
echo mb_convert_encoding ( 'äìè', 'ISO-8859-1', 'windows-1251' );
echo "\n";
echo mb_convert_encoding ( 'äìè', 'windows-1251', 'ISO-8859-1' );