function win_to_utf8($str){
$str = convert_cyr_string($str, 'w','i'); // w - windows-1251  to  i - iso8859-5
$str = utf8_encode ($str); //  iso8859-5  to  utf8
return $str;
}

function utf8_to_win($str){
$str = utf8_decode ($str); //  utf8 to iso8859-5 
$str = convert_cyr_string($str, 'i','w'); // w - windows-1251  to  i - iso8859-5
return $str;
}