utf8decode (can use with PHP utf8_encode)

//not by me

std::string toEscaped( std::string const& original )//<< utf8decode - use utf8_encode in PHP and get the normal string
{
    std::string results ;
    for ( std::string::const_iterator iter = original.begin();
            iter != original.end();
            ++ iter ) {
        static bool const allowed[256];
        if ( allowed[static_cast<unsigned char>(*iter)] ) {
            results += *iter;
        } else {
            static char const hexChars[] = "0123456789ABCDEF";
            results += '%';
            results += hexChars[(*iter >> 4) & 0x0F];
            results += hexChars[(*iter     ) & 0x0F];
        }
    }
    return results;
}