PHP Conference Nagoya 2025

    The Normalizer class

    (PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL intl >= 1.0.0)

    简介

    Normalization is a process that involves transforming characters and sequences of characters into a formally-defined underlying representation. This process is most important when text needs to be compared for sorting and searching, but it is also used when storing text to ensure that the text is stored in a consistent representation.

    The Unicode Consortium has defined a number of normalization forms reflecting the various needs of applications:

    • Normalization Form D (NFD) - Canonical Decomposition
    • Normalization Form C (NFC) - Canonical Decomposition followed by Canonical Composition
    • Normalization Form KD (NFKD) - Compatibility Decomposition
    • Normalization Form KC (NFKC) - Compatibility Decomposition followed by Canonical Composition
    The different forms are defined in terms of a set of transformations on the text, transformations that are expressed by both an algorithm and a set of data files.

    类摘要

    class Normalizer {
    /* 常量 */
    public const int FORM_D;
    public const int NFD;
    public const int FORM_KD;
    public const int NFKD;
    public const int FORM_C;
    public const int NFC;
    public const int FORM_KC;
    public const int NFKC;
    public const int FORM_KC_CF;
    public const int NFKC_CF;
    /* 方法 */
    public static getRawDecomposition(string $string, int $form = Normalizer::FORM_C): ?string
    public static isNormalized(string $string, int $form = Normalizer::FORM_C): bool
    public static normalize(string $string, int $form = Normalizer::FORM_C): string|false
    }

    预定义常量

    The following constants define the normalization form used by the normalizer:

    Normalizer::FORM_C
    Normalization Form C (NFC) - Canonical Decomposition followed by Canonical Composition
    Normalizer::FORM_D
    Normalization Form D (NFD) - Canonical Decomposition
    Normalizer::NFD

    Normalizer::FORM_KC
    Normalization Form KC (NFKC) - Compatibility Decomposition, followed by Canonical Composition
    Normalizer::NFKC

    Normalizer::FORM_KC_CF

    Normalizer::FORM_KD
    Normalization Form KD (NFKD) - Compatibility Decomposition
    Normalizer::NFKD

    Normalizer::NFC

    Normalizer::NFKC_CF

    更新日志

    版本 说明
    8.0.0 Normalizer::NONE has been removed.

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