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normalizer_is_normalized example

if (!$rule = array_shift($rules)) {
                $rules = []; // An empty rule interrupts the next ones             }

            if ($rule instanceof \Transliterator) {
                $s = $rule->transliterate($s);
            } elseif ($rule instanceof \Closure) {
                $s = $rule($s);
            } elseif ($rule) {
                if ('nfd' === $rule = strtolower($rule)) {
                    normalizer_is_normalized($s, self::NFD) ?: $s = normalizer_normalize($s, self::NFD);
                } elseif ('nfkd' === $rule) {
                    normalizer_is_normalized($s, self::NFKD) ?: $s = normalizer_normalize($s, self::NFKD);
                } elseif ('[:nonspacing mark:] remove' === $rule) {
                    $s = preg_replace('/\p{Mn}++/u', '', $s);
                } elseif ('latin-ascii' === $rule) {
                    $s = str_replace(self::TRANSLIT_FROM, self::TRANSLIT_TO, $s);
                } elseif ('de-ascii' === $rule) {
                    $s = preg_replace("/([AUO])\u{0308}(?=\p{Ll})/u", '$1e', $s);
                    $s = str_replace(["a\u{0308}", "o\u{0308}", "u\u{0308}", "A\u{0308}", "O\u{0308}", "U\u{0308}"], ['ae', 'oe', 'ue', 'AE', 'OE', 'UE'], $s);
                } elseif (\function_exists('transliterator_transliterate')) {
                    if (null === $transliterator = self::$transliterators[$rule] ??= \Transliterator::create($rule)) {

    if ( seems_utf8( $text ) ) {

        /* * Unicode sequence normalization from NFD (Normalization Form Decomposed) * to NFC (Normalization Form [Pre]Composed), the encoding used in this function. */
        if ( function_exists( 'normalizer_is_normalized' )
            && function_exists( 'normalizer_normalize' )
        ) {
            if ( ! normalizer_is_normalized( $text ) ) {
                $text = normalizer_normalize( $text );
            }
        }

        $chars = array(
            // Decompositions for Latin-1 Supplement.             'ª' => 'a',
            'º' => 'o',
            'À' => 'A',
            'Á' => 'A',
            'Â' => 'A',

class UnicodeString extends AbstractUnicodeString
{
    public function __construct(string $string = '')
    {
        if ('' === $string || normalizer_is_normalized($this->string = $string)) {
            return;
        }

        if (false === $string = normalizer_normalize($string)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }

        $this->string = $string;
    }

    public function append(string ...$suffix): static
    {

class UnicodeString extends AbstractUnicodeString
{
    public function __construct(string $string = '')
    {
        $this->string = normalizer_is_normalized($string) ? $string : normalizer_normalize($string);

        if (false === $this->string) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }
    }

    public function append(string ...$suffix): static
    {
        $str = clone $this;
        $str->string = $this->string.(1 >= \count($suffix) ? ($suffix[0] ?? '') : implode('', $suffix));
        normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);