/**
* Convert a UTF-8 string to normal form KC, compatibility composition.
* This may cause irreversible information loss, use judiciously.
* Fast return for pure ASCII strings.
*
* @param $string String: a valid UTF-8 string. Input is not validated.
* @return string a UTF-8 string in normal form KC
*/
static function toNFKC($string)
{
if (NORMALIZE_INTL) {
return normalizer_normalize($string, Normalizer::FORM_KC);
} elseif (NORMALIZE_ICU) {
return utf8_normalize($string, UNORM_NFKC);
} elseif (preg_match('/[\\x80-\\xff]/', $string)) {
return UtfNormal::NFKC($string);
} else {
return $string;
}
}
$replaced = false;
foreach ($translation as $symbol => $character) {
$sym_pos = strpos($buffer, $symbol);
if ($sym_pos !== false) {
$sym_length = strlen($symbol);
$piece1 = substr($buffer, 0, $sym_pos);
if ($character['switch']) {
// the character after the special charater needs to come before it
$partnerchar = utf8_encode($buffer[$sym_pos + $sym_length]);
$piece2 = unicode_to_utf8(array_merge(utf8_to_unicode($partnerchar), $character['unicode']));
$piece3start = $sym_pos + $sym_length + 1;
} else {
$piece2 = unicode_to_utf8($character['unicode']);
$piece3start = $sym_pos + $sym_length;
}
$piece2 = utf8_decode(UtfNormal::NFKC($piece2));
// strip out any ? characters, which are characters not existing in ISO-8859-1
$piece2 = str_replace('?', '', $piece2);
$piece3 = substr($buffer, $piece3start);
$buffer = $piece1 . $piece2 . $piece3;
$replaced = true;
continue;
}
}
if (!$replaced) {
// we've encountered some character that we have no translation for
echo "unable to find a translation to transform this buffer, the untranslatable code will be stripped out:\n{$buffer}\n";
$pieces = preg_split('/\\$\\d*/', $buffer, 2);
$buffer = implode('', $pieces);
}
}
