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WP_Translation_Controller

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概述

WP_Translation_Controller 是 WordPress 6.5.0 引入的最终类，用于管理翻译文件和字符串翻译。它提供单例模式实例，支持加载、卸载翻译文件，检查翻译状态，以及执行单数和复数翻译。

关键要点

  • WP_Translation_Controller 是一个最终类，用于集中管理 WordPress 的翻译功能。
  • 提供单例访问方法 get_instance()，确保全局唯一实例。
  • 核心方法包括 load_file()、unload_file()、translate()、translate_plural() 等，用于处理翻译文件加载和字符串翻译。
  • 支持通过 get_locale() 和 set_locale() 管理当前区域设置。
  • 包含辅助方法如 is_textdomain_loaded()、has_translation() 来检查翻译状态。
  • 内部使用数组结构存储加载的翻译文件和条目，如 $loaded_translations 和 $loaded_files。
  • 自 WordPress 6.5.0 引入，后续版本如 6.7.0 添加了 has_translation() 方法。

代码示例

// 获取 WP_Translation_Controller 实例
$controller = WP_Translation_Controller::get_instance();

// 设置当前区域为中文
$controller->set_locale('zh_CN');

// 加载翻译文件
$controller->load_file('/path/to/translation.mo', 'my-textdomain');

// 翻译字符串
$translated = $controller->translate('Hello', '', 'my-textdomain');
if ($translated !== false) {
    echo $translated;
}

// 检查翻译是否存在
if ($controller->has_translation('Hello', 'my-textdomain')) {
    echo '翻译存在';
}

注意事项

  • WP_Translation_Controller 是最终类，不能被继承。
  • 翻译文件路径应使用绝对路径，load_file() 方法会通过 realpath() 处理。
  • 默认文本域为 'default'，区域设置默认为 'en_US'，可通过方法参数覆盖。
  • 复数翻译时，translate_plural() 方法会处理单复数形式，并回退到单数翻译。
  • 错误处理：加载失败时返回 false，翻译未找到时返回 false。
📄 原文内容

Class WP_Translation_Controller.

Methods

Name Description
WP_Translation_Controller::get_entries Returns all entries for a given text domain.
WP_Translation_Controller::get_files Returns all translation files for a given text domain.
WP_Translation_Controller::get_headers Returns all existing headers for a given text domain.
WP_Translation_Controller::get_instance Utility method to retrieve the main instance of the class.
WP_Translation_Controller::get_locale Returns the current locale.
WP_Translation_Controller::has_translation Returns a boolean to indicate whether a translation exists for a given string with optional text domain and locale.
WP_Translation_Controller::is_textdomain_loaded Determines whether translations are loaded for a given text domain.
WP_Translation_Controller::load_file Loads a translation file for a given text domain.
WP_Translation_Controller::locate_translation Locates translation for a given string and text domain.
WP_Translation_Controller::normalize_header Normalizes header names to be capitalized.
WP_Translation_Controller::set_locale Sets the current locale.
WP_Translation_Controller::translate Translates a singular string.
WP_Translation_Controller::translate_plural Translates plurals.
WP_Translation_Controller::unload_file Unloads a translation file for a given text domain.
WP_Translation_Controller::unload_textdomain Unloads all translation files for a given text domain.

Source

final class WP_Translation_Controller {
	/**
	 * Current locale.
	 *
	 * @since 6.5.0
	 * @var string
	 */
	protected $current_locale = 'en_US';

	/**
	 * Map of loaded translations per locale and text domain.
	 *
	 * [ Locale => [ Textdomain => [ ..., ... ] ] ]
	 *
	 * @since 6.5.0
	 * @var array<string, array<string, WP_Translation_File[]>>
	 */
	protected $loaded_translations = array();

	/**
	 * List of loaded translation files.
	 *
	 * [ Filename => [ Locale => [ Textdomain => WP_Translation_File ] ] ]
	 *
	 * @since 6.5.0
	 * @var array<string, array<string, array<string, WP_Translation_File|false>>>
	 */
	protected $loaded_files = array();

	/**
	 * Container for the main instance of the class.
	 *
	 * @since 6.5.0
	 * @var WP_Translation_Controller|null
	 */
	private static $instance = null;

	/**
	 * Utility method to retrieve the main instance of the class.
	 *
	 * The instance will be created if it does not exist yet.
	 *
	 * @since 6.5.0
	 *
	 * @return WP_Translation_Controller
	 */
	public static function get_instance(): WP_Translation_Controller {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * Returns the current locale.
	 *
	 * @since 6.5.0
	 *
	 * @return string Locale.
	 */
	public function get_locale(): string {
		return $this->current_locale;
	}

	/**
	 * Sets the current locale.
	 *
	 * @since 6.5.0
	 *
	 * @param string $locale Locale.
	 */
	public function set_locale( string $locale ) {
		$this->current_locale = $locale;
	}

	/**
	 * Loads a translation file for a given text domain.
	 *
	 * @since 6.5.0
	 *
	 * @param string $translation_file Translation file.
	 * @param string $textdomain       Optional. Text domain. Default 'default'.
	 * @param string $locale           Optional. Locale. Default current locale.
	 * @return bool True on success, false otherwise.
	 */
	public function load_file( string $translation_file, string $textdomain = 'default', ?string $locale = null ): bool {
		if ( null === $locale ) {
			$locale = $this->current_locale;
		}

		$translation_file = realpath( $translation_file );

		if ( false === $translation_file ) {
			return false;
		}

		if (
			isset( $this->loaded_files[ $translation_file ][ $locale ][ $textdomain ] ) &&
			false !== $this->loaded_files[ $translation_file ][ $locale ][ $textdomain ]
		) {
			return null === $this->loaded_files[ $translation_file ][ $locale ][ $textdomain ]->error();
		}

		if (
			isset( $this->loaded_files[ $translation_file ][ $locale ] ) &&
			array() !== $this->loaded_files[ $translation_file ][ $locale ]
		) {
			$moe = reset( $this->loaded_files[ $translation_file ][ $locale ] );
		} else {
			$moe = WP_Translation_File::create( $translation_file );
			if ( false === $moe || null !== $moe->error() ) {
				$moe = false;
			}
		}

		$this->loaded_files[ $translation_file ][ $locale ][ $textdomain ] = $moe;

		if ( ! $moe instanceof WP_Translation_File ) {
			return false;
		}

		if ( ! isset( $this->loaded_translations[ $locale ][ $textdomain ] ) ) {
			$this->loaded_translations[ $locale ][ $textdomain ] = array();
		}

		$this->loaded_translations[ $locale ][ $textdomain ][] = $moe;

		return true;
	}

	/**
	 * Unloads a translation file for a given text domain.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Translation_File|string $file       Translation file instance or file name.
	 * @param string                     $textdomain Optional. Text domain. Default 'default'.
	 * @param string                     $locale     Optional. Locale. Defaults to all locales.
	 * @return bool True on success, false otherwise.
	 */
	public function unload_file( $file, string $textdomain = 'default', ?string $locale = null ): bool {
		if ( is_string( $file ) ) {
			$file = realpath( $file );
		}

		if ( null !== $locale ) {
			if ( isset( $this->loaded_translations[ $locale ][ $textdomain ] ) ) {
				foreach ( $this->loaded_translations[ $locale ][ $textdomain ] as $i => $moe ) {
					if ( $file === $moe || $file === $moe->get_file() ) {
						unset( $this->loaded_translations[ $locale ][ $textdomain ][ $i ] );
						unset( $this->loaded_files[ $moe->get_file() ][ $locale ][ $textdomain ] );
						return true;
					}
				}
			}

			return true;
		}

		foreach ( $this->loaded_translations as $l => $domains ) {
			if ( ! isset( $domains[ $textdomain ] ) ) {
				continue;
			}

			foreach ( $domains[ $textdomain ] as $i => $moe ) {
				if ( $file === $moe || $file === $moe->get_file() ) {
					unset( $this->loaded_translations[ $l ][ $textdomain ][ $i ] );
					unset( $this->loaded_files[ $moe->get_file() ][ $l ][ $textdomain ] );
					return true;
				}
			}
		}

		return false;
	}

	/**
	 * Unloads all translation files for a given text domain.
	 *
	 * @since 6.5.0
	 *
	 * @param string $textdomain Optional. Text domain. Default 'default'.
	 * @param string $locale     Optional. Locale. Defaults to all locales.
	 * @return bool True on success, false otherwise.
	 */
	public function unload_textdomain( string $textdomain = 'default', ?string $locale = null ): bool {
		$unloaded = false;

		if ( null !== $locale ) {
			if ( isset( $this->loaded_translations[ $locale ][ $textdomain ] ) ) {
				$unloaded = true;
				foreach ( $this->loaded_translations[ $locale ][ $textdomain ] as $moe ) {
					unset( $this->loaded_files[ $moe->get_file() ][ $locale ][ $textdomain ] );
				}
			}

			unset( $this->loaded_translations[ $locale ][ $textdomain ] );

			return $unloaded;
		}

		foreach ( $this->loaded_translations as $l => $domains ) {
			if ( ! isset( $domains[ $textdomain ] ) ) {
				continue;
			}

			$unloaded = true;

			foreach ( $domains[ $textdomain ] as $moe ) {
				unset( $this->loaded_files[ $moe->get_file() ][ $l ][ $textdomain ] );
			}

			unset( $this->loaded_translations[ $l ][ $textdomain ] );
		}

		return $unloaded;
	}

	/**
	 * Determines whether translations are loaded for a given text domain.
	 *
	 * @since 6.5.0
	 *
	 * @param string $textdomain Optional. Text domain. Default 'default'.
	 * @param string $locale     Optional. Locale. Default current locale.
	 * @return bool True if there are any loaded translations, false otherwise.
	 */
	public function is_textdomain_loaded( string $textdomain = 'default', ?string $locale = null ): bool {
		if ( null === $locale ) {
			$locale = $this->current_locale;
		}

		return isset( $this->loaded_translations[ $locale ][ $textdomain ] ) &&
			array() !== $this->loaded_translations[ $locale ][ $textdomain ];
	}

	/**
	 * Translates a singular string.
	 *
	 * @since 6.5.0
	 *
	 * @param string $text       Text to translate.
	 * @param string $context    Optional. Context for the string. Default empty string.
	 * @param string $textdomain Optional. Text domain. Default 'default'.
	 * @param string $locale     Optional. Locale. Default current locale.
	 * @return string|false Translation on success, false otherwise.
	 */
	public function translate( string $text, string $context = '', string $textdomain = 'default', ?string $locale = null ) {
		if ( '' !== $context ) {
			$context .= "4";
		}

		$translation = $this->locate_translation( "{$context}{$text}", $textdomain, $locale );

		if ( false === $translation ) {
			return false;
		}

		return $translation['entries'][0];
	}

	/**
	 * Translates plurals.
	 *
	 * Checks both singular+plural combinations as well as just singulars,
	 * in case the translation file does not store the plural.
	 *
	 * @since 6.5.0
	 *
	 * @param array       $plurals {
	 *     Pair of singular and plural translations.
	 *
	 *     @type string $0 Singular translation.
	 *     @type string $1 Plural translation.
	 * }
	 * @param int         $number     Number of items.
	 * @param string      $context    Optional. Context for the string. Default empty string.
	 * @param string      $textdomain Optional. Text domain. Default 'default'.
	 * @param string|null $locale     Optional. Locale. Default current locale.
	 * @return string|false Translation on success, false otherwise.
	 */
	public function translate_plural( array $plurals, int $number, string $context = '', string $textdomain = 'default', ?string $locale = null ) {
		if ( '' !== $context ) {
			$context .= "4";
		}

		$text        = implode( "", $plurals );
		$translation = $this->locate_translation( "{$context}{$text}", $textdomain, $locale );

		if ( false === $translation ) {
			$text        = $plurals[0];
			$translation = $this->locate_translation( "{$context}{$text}", $textdomain, $locale );

			if ( false === $translation ) {
				return false;
			}
		}

		/** @var WP_Translation_File $source */
		$source = $translation['source'];
		$num    = $source->get_plural_form( $number );

		// See Translations::translate_plural().
		return $translation['entries'][ $num ] ?? $translation['entries'][0];
	}

	/**
	 * Returns all existing headers for a given text domain.
	 *
	 * @since 6.5.0
	 *
	 * @param string $textdomain Optional. Text domain. Default 'default'.
	 * @return array<string, string> Headers.
	 */
	public function get_headers( string $textdomain = 'default' ): array {
		if ( array() === $this->loaded_translations ) {
			return array();
		}

		$headers = array();

		foreach ( $this->get_files( $textdomain ) as $moe ) {
			foreach ( $moe->headers() as $header => $value ) {
				$headers[ $this->normalize_header( $header ) ] = $value;
			}
		}

		return $headers;
	}

	/**
	 * Normalizes header names to be capitalized.
	 *
	 * @since 6.5.0
	 *
	 * @param string $header Header name.
	 * @return string Normalized header name.
	 */
	protected function normalize_header( string $header ): string {
		$parts = explode( '-', $header );
		$parts = array_map( 'ucfirst', $parts );
		return implode( '-', $parts );
	}

	/**
	 * Returns all entries for a given text domain.
	 *
	 * @since 6.5.0
	 *
	 * @param string $textdomain Optional. Text domain. Default 'default'.
	 * @return array<string, string> Entries.
	 */
	public function get_entries( string $textdomain = 'default' ): array {
		if ( array() === $this->loaded_translations ) {
			return array();
		}

		$entries = array();

		foreach ( $this->get_files( $textdomain ) as $moe ) {
			$entries = array_merge( $entries, $moe->entries() );
		}

		return $entries;
	}

	/**
	 * Locates translation for a given string and text domain.
	 *
	 * @since 6.5.0
	 *
	 * @param string $singular   Singular translation.
	 * @param string $textdomain Optional. Text domain. Default 'default'.
	 * @param string $locale     Optional. Locale. Default current locale.
	 * @return array{source: WP_Translation_File, entries: string[]}|false {
	 *     Translations on success, false otherwise.
	 *
	 *     @type WP_Translation_File $source Translation file instance.
	 *     @type string[]            $entries Array of translation entries.
	 * }
	 */
	protected function locate_translation( string $singular, string $textdomain = 'default', ?string $locale = null ) {
		if ( array() === $this->loaded_translations ) {
			return false;
		}

		// Find the translation in all loaded files for this text domain.
		foreach ( $this->get_files( $textdomain, $locale ) as $moe ) {
			$translation = $moe->translate( $singular );
			if ( false !== $translation ) {
				return array(
					'entries' => explode( "", $translation ),
					'source'  => $moe,
				);
			}
			if ( null !== $moe->error() ) {
				// Unload this file, something is wrong.
				$this->unload_file( $moe, $textdomain, $locale );
			}
		}

		// Nothing could be found.
		return false;
	}

	/**
	 * Returns all translation files for a given text domain.
	 *
	 * @since 6.5.0
	 *
	 * @param string $textdomain Optional. Text domain. Default 'default'.
	 * @param string $locale     Optional. Locale. Default current locale.
	 * @return WP_Translation_File[] List of translation files.
	 */
	protected function get_files( string $textdomain = 'default', ?string $locale = null ): array {
		if ( null === $locale ) {
			$locale = $this->current_locale;
		}

		return $this->loaded_translations[ $locale ][ $textdomain ] ?? array();
	}

	/**
	 * Returns a boolean to indicate whether a translation exists for a given string with optional text domain and locale.
	 *
	 * @since 6.7.0
	 *
	 * @param string  $singular   Singular translation to check.
	 * @param string  $textdomain Optional. Text domain. Default 'default'.
	 * @param ?string $locale     Optional. Locale. Default current locale.
	 * @return bool  True if the translation exists, false otherwise.
	 */
	public function has_translation( string $singular, string $textdomain = 'default', ?string $locale = null ): bool {
		if ( null === $locale ) {
			$locale = $this->current_locale;
		}

		return false !== $this->locate_translation( $singular, $textdomain, $locale );
	}
}

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Changelog

Version Description
6.5.0 Introduced.