l10n.php

<?php
/**
 * Core Translation API
 *
 * @package WordPress
 * @subpackage i18n
 * @since 1.2.0
 */

/**
 * Retrieves the current locale.
 *
 * If the locale is set, then it will filter the locale in the {@see 'locale'}
 * filter hook and return the value.
 *
 * If the locale is not set already, then the WPLANG constant is used if it is
 * defined. Then it is filtered through the {@see 'locale'} filter hook and
 * the value for the locale global set and the locale is returned.
 *
 * The process to get the locale should only be done once, but the locale will
 * always be filtered using the {@see 'locale'} hook.
 *
 * @since 1.5.0
 *
 * @global string $locale           The current locale.
 * @global string $wp_local_package Locale code of the package.
 *
 * @return string The locale of the blog or from the {@see 'locale'} hook.
 */
function get_locale() {
	global $locale, $wp_local_package;

	if ( isset( $locale ) ) {
		/** This filter is documented in wp-includes/l10n.php */
		return apply_filters( 'locale', $locale );
	}

	if ( isset( $wp_local_package ) ) {
		$locale = $wp_local_package;
	}

	// WPLANG was defined in wp-config.
	if ( defined( 'WPLANG' ) ) {
		$locale = WPLANG;
	}

	// If multisite, check options.
	if ( is_multisite() ) {
		// Don't check blog option when installing.
		if ( wp_installing() ) {
			$ms_locale = get_site_option( 'WPLANG' );
		} else {
			$ms_locale = get_option( 'WPLANG' );
			if ( false === $ms_locale ) {
				$ms_locale = get_site_option( 'WPLANG' );
			}
		}

		if ( false !== $ms_locale ) {
			$locale = $ms_locale;
		}
	} else {
		$db_locale = get_option( 'WPLANG' );
		if ( false !== $db_locale ) {
			$locale = $db_locale;
		}
	}

	if ( empty( $locale ) ) {
		$locale = 'en_US';
	}

	/**
	 * Filters the locale ID of the WordPress installation.
	 *
	 * @since 1.5.0
	 *
	 * @param string $locale The locale ID.
	 */
	return apply_filters( 'locale', $locale );
}

/**
 * Retrieves the locale of a user.
 *
 * If the user has a locale set to a non-empty string then it will be
 * returned. Otherwise it returns the locale of get_locale().
 *
 * @since 4.7.0
 *
 * @param int|WP_User $user User's ID or a WP_User object. Defaults to current user.
 * @return string The locale of the user.
 */
function get_user_locale( $user = 0 ) {
	$user_object = false;

	if ( 0 === $user && function_exists( 'wp_get_current_user' ) ) {
		$user_object = wp_get_current_user();
	} elseif ( $user instanceof WP_User ) {
		$user_object = $user;
	} elseif ( $user && is_numeric( $user ) ) {
		$user_object = get_user_by( 'id', $user );
	}

	if ( ! $user_object ) {
		return get_locale();
	}

	$locale = $user_object->locale;

	return $locale ? $locale : get_locale();
}

/**
 * Determines the current locale desired for the request.
 *
 * @since 5.0.0
 *
 * @global string $pagenow The filename of the current screen.
 *
 * @return string The determined locale.
 */
function determine_locale() {
	/**
	 * Filters the locale for the current request prior to the default determination process.
	 *
	 * Using this filter allows to override the default logic, effectively short-circuiting the function.
	 *
	 * @since 5.0.0
	 *
	 * @param string|null $locale The locale to return and short-circuit. Default null.
	 */
	$determined_locale = apply_filters( 'pre_determine_locale', null );

	if ( $determined_locale && is_string( $determined_locale ) ) {
		return $determined_locale;
	}

	if (
		isset( $GLOBALS['pagenow'] ) && 'wp-login.php' === $GLOBALS['pagenow'] &&
		( ! empty( $_GET['wp_lang'] ) || ! empty( $_COOKIE['wp_lang'] ) )
	) {
		if ( ! empty( $_GET['wp_lang'] ) ) {
			$determined_locale = sanitize_locale_name( $_GET['wp_lang'] );
		} else {
			$determined_locale = sanitize_locale_name( $_COOKIE['wp_lang'] );
		}
	} elseif (
		is_admin() ||
		( isset( $_GET['_locale'] ) && 'user' === $_GET['_locale'] && wp_is_json_request() )
	) {
		$determined_locale = get_user_locale();
	} elseif (
		( ! empty( $_REQUEST['language'] ) || isset( $GLOBALS['wp_local_package'] ) )
		&& wp_installing()
	) {
		if ( ! empty( $_REQUEST['language'] ) ) {
			$determined_locale = sanitize_locale_name( $_REQUEST['language'] );
		} else {
			$determined_locale = $GLOBALS['wp_local_package'];
		}
	}

	if ( ! $determined_locale ) {
		$determined_locale = get_locale();
	}

	/**
	 * Filters the locale for the current request.
	 *
	 * @since 5.0.0
	 *
	 * @param string $determined_locale The locale.
	 */
	return apply_filters( 'determine_locale', $determined_locale );
}

/**
 * Retrieves the translation of $text.
 *
 * If there is no translation, or the text domain isn't loaded, the original text is returned.
 *
 * *Note:* Don't use translate() directly, use __() or related functions.
 *
 * @since 2.2.0
 * @since 5.5.0 Introduced `gettext-{$domain}` filter.
 *
 * @param string $text   Text to translate.
 * @param string $domain Optional. Text domain. Unique identifier for retrieving translated strings.
 *                       Default 'default'.
 * @return string Translated text.
 */
function translate( $text, $domain = 'default' ) {
	$translations = get_translations_for_domain( $domain );
	$translation  = $translations->translate( $text );

	/**
	 * Filters text with its translation.
	 *
	 * @since 2.0.11
	 *
	 * @param string $translation Translated text.
	 * @param string $text        Text to translate.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( 'gettext', $translation, $text, $domain );

	/**
	 * Filters text with its translation for a domain.
	 *
	 * The dynamic portion of the hook name, `$domain`, refers to the text domain.
	 *
	 * @since 5.5.0
	 *
	 * @param string $translation Translated text.
	 * @param string $text        Text to translate.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( "gettext_{$domain}", $translation, $text, $domain );

	return $translation;
}

/**
 * Removes last item on a pipe-delimited string.
 *
 * Meant for removing the last item in a string, such as 'Role name|User role'. The original
 * string will be returned if no pipe '|' characters are found in the string.
 *
 * @since 2.8.0
 *
 * @param string $text A pipe-delimited string.
 * @return string Either $text or everything before the last pipe.
 */
function before_last_bar( $text ) {
	$last_bar = strrpos( $text, '|' );
	if ( false === $last_bar ) {
		return $text;
	} else {
		return substr( $text, 0, $last_bar );
	}
}

/**
 * Retrieves the translation of $text in the context defined in $context.
 *
 * If there is no translation, or the text domain isn't loaded, the original text is returned.
 *
 * *Note:* Don't use translate_with_gettext_context() directly, use _x() or related functions.
 *
 * @since 2.8.0
 * @since 5.5.0 Introduced `gettext_with_context-{$domain}` filter.
 *
 * @param string $text    Text to translate.
 * @param string $context Context information for the translators.
 * @param string $domain  Optional. Text domain. Unique identifier for retrieving translated strings.
 *                        Default 'default'.
 * @return string Translated text on success, original text on failure.
 */
function translate_with_gettext_context( $text, $context, $domain = 'default' ) {
	$translations = get_translations_for_domain( $domain );
	$translation  = $translations->translate( $text, $context );

	/**
	 * Filters text with its translation based on context information.
	 *
	 * @since 2.8.0
	 *
	 * @param string $translation Translated text.
	 * @param string $text        Text to translate.
	 * @param string $context     Context information for the translators.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( 'gettext_with_context', $translation, $text, $context, $domain );

	/**
	 * Filters text with its translation based on context information for a domain.
	 *
	 * The dynamic portion of the hook name, `$domain`, refers to the text domain.
	 *
	 * @since 5.5.0
	 *
	 * @param string $translation Translated text.
	 * @param string $text        Text to translate.
	 * @param string $context     Context information for the translators.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( "gettext_with_context_{$domain}", $translation, $text, $context, $domain );

	return $translation;
}

/**
 * Retrieves the translation of $text.
 *
 * If there is no translation, or the text domain isn't loaded, the original text is returned.
 *
 * @since 2.1.0
 *
 * @param string $text   Text to translate.
 * @param string $domain Optional. Text domain. Unique identifier for retrieving translated strings.
 *                       Default 'default'.
 * @return string Translated text.
 */
function __( $text, $domain = 'default' ) {
	return translate( $text, $domain );
}

/**
 * Retrieves the translation of $text and escapes it for safe use in an attribute.
 *
 * If there is no translation, or the text domain isn't loaded, the original text is returned.
 *
 * @since 2.8.0
 *
 * @param string $text   Text to translate.
 * @param string $domain Optional. Text domain. Unique identifier for retrieving translated strings.
 *                       Default 'default'.
 * @return string Translated text on success, original text on failure.
 */
function esc_attr__( $text, $domain = 'default' ) {
	return esc_attr( translate( $text, $domain ) );
}

/**
 * Retrieves the translation of $text and escapes it for safe use in HTML output.
 *
 * If there is no translation, or the text domain isn't loaded, the original text
 * is escaped and returned.
 *
 * @since 2.8.0
 *
 * @param string $text   Text to translate.
 * @param string $domain Optional. Text domain. Unique identifier for retrieving translated strings.
 *                       Default 'default'.
 * @return string Translated text.
 */
function esc_html__( $text, $domain = 'default' ) {
	return esc_html( translate( $text, $domain ) );
}

/**
 * Displays translated text.
 *
 * @since 1.2.0
 *
 * @param string $text   Text to translate.
 * @param string $domain Optional. Text domain. Unique identifier for retrieving translated strings.
 *                       Default 'default'.
 */
function _e( $text, $domain = 'default' ) {
	echo translate( $text, $domain );
}

/**
 * Displays translated text that has been escaped for safe use in an attribute.
 *
 * Encodes `< > & " '` (less than, greater than, ampersand, double quote, single quote).
 * Will never double encode entities.
 *
 * If you need the value for use in PHP, use esc_attr__().
 *
 * @since 2.8.0
 *
 * @param string $text   Text to translate.
 * @param string $domain Optional. Text domain. Unique identifier for retrieving translated strings.
 *                       Default 'default'.
 */
function esc_attr_e( $text, $domain = 'default' ) {
	echo esc_attr( translate( $text, $domain ) );
}

/**
 * Displays translated text that has been escaped for safe use in HTML output.
 *
 * If there is no translation, or the text domain isn't loaded, the original text
 * is escaped and displayed.
 *
 * If you need the value for use in PHP, use esc_html__().
 *
 * @since 2.8.0
 *
 * @param string $text   Text to translate.
 * @param string $domain Optional. Text domain. Unique identifier for retrieving translated strings.
 *                       Default 'default'.
 */
function esc_html_e( $text, $domain = 'default' ) {
	echo esc_html( translate( $text, $domain ) );
}

/**
 * Retrieves translated string with gettext context.
 *
 * Quite a few times, there will be collisions with similar translatable text
 * found in more than two places, but with different translated context.
 *
 * By including the context in the pot file, translators can translate the two
 * strings differently.
 *
 * @since 2.8.0
 *
 * @param string $text    Text to translate.
 * @param string $context Context information for the translators.
 * @param string $domain  Optional. Text domain. Unique identifier for retrieving translated strings.
 *                        Default 'default'.
 * @return string Translated context string without pipe.
 */
function _x( $text, $context, $domain = 'default' ) {
	return translate_with_gettext_context( $text, $context, $domain );
}

/**
 * Displays translated string with gettext context.
 *
 * @since 3.0.0
 *
 * @param string $text    Text to translate.
 * @param string $context Context information for the translators.
 * @param string $domain  Optional. Text domain. Unique identifier for retrieving translated strings.
 *                        Default 'default'.
 */
function _ex( $text, $context, $domain = 'default' ) {
	echo _x( $text, $context, $domain );
}

/**
 * Translates string with gettext context, and escapes it for safe use in an attribute.
 *
 * If there is no translation, or the text domain isn't loaded, the original text
 * is escaped and returned.
 *
 * @since 2.8.0
 *
 * @param string $text    Text to translate.
 * @param string $context Context information for the translators.
 * @param string $domain  Optional. Text domain. Unique identifier for retrieving translated strings.
 *                        Default 'default'.
 * @return string Translated text.
 */
function esc_attr_x( $text, $context, $domain = 'default' ) {
	return esc_attr( translate_with_gettext_context( $text, $context, $domain ) );
}

/**
 * Translates string with gettext context, and escapes it for safe use in HTML output.
 *
 * If there is no translation, or the text domain isn't loaded, the original text
 * is escaped and returned.
 *
 * @since 2.9.0
 *
 * @param string $text    Text to translate.
 * @param string $context Context information for the translators.
 * @param string $domain  Optional. Text domain. Unique identifier for retrieving translated strings.
 *                        Default 'default'.
 * @return string Translated text.
 */
function esc_html_x( $text, $context, $domain = 'default' ) {
	return esc_html( translate_with_gettext_context( $text, $context, $domain ) );
}

/**
 * Translates and retrieves the singular or plural form based on the supplied number.
 *
 * Used when you want to use the appropriate form of a string based on whether a
 * number is singular or plural.
 *
 * Example:
 *
 *     printf( _n( '%s person', '%s people', $count, 'text-domain' ), number_format_i18n( $count ) );
 *
 * @since 2.8.0
 * @since 5.5.0 Introduced `ngettext-{$domain}` filter.
 *
 * @param string $single The text to be used if the number is singular.
 * @param string $plural The text to be used if the number is plural.
 * @param int    $number The number to compare against to use either the singular or plural form.
 * @param string $domain Optional. Text domain. Unique identifier for retrieving translated strings.
 *                       Default 'default'.
 * @return string The translated singular or plural form.
 */
function _n( $single, $plural, $number, $domain = 'default' ) {
	$translations = get_translations_for_domain( $domain );
	$translation  = $translations->translate_plural( $single, $plural, $number );

	/**
	 * Filters the singular or plural form of a string.
	 *
	 * @since 2.2.0
	 *
	 * @param string $translation Translated text.
	 * @param string $single      The text to be used if the number is singular.
	 * @param string $plural      The text to be used if the number is plural.
	 * @param int    $number      The number to compare against to use either the singular or plural form.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( 'ngettext', $translation, $single, $plural, $number, $domain );

	/**
	 * Filters the singular or plural form of a string for a domain.
	 *
	 * The dynamic portion of the hook name, `$domain`, refers to the text domain.
	 *
	 * @since 5.5.0
	 *
	 * @param string $translation Translated text.
	 * @param string $single      The text to be used if the number is singular.
	 * @param string $plural      The text to be used if the number is plural.
	 * @param int    $number      The number to compare against to use either the singular or plural form.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( "ngettext_{$domain}", $translation, $single, $plural, $number, $domain );

	return $translation;
}

/**
 * Translates and retrieves the singular or plural form based on the supplied number, with gettext context.
 *
 * This is a hybrid of _n() and _x(). It supports context and plurals.
 *
 * Used when you want to use the appropriate form of a string with context based on whether a
 * number is singular or plural.
 *
 * Example of a generic phrase which is disambiguated via the context parameter:
 *
 *     printf( _nx( '%s group', '%s groups', $people, 'group of people', 'text-domain' ), number_format_i18n( $people ) );
 *     printf( _nx( '%s group', '%s groups', $animals, 'group of animals', 'text-domain' ), number_format_i18n( $animals ) );
 *
 * @since 2.8.0
 * @since 5.5.0 Introduced `ngettext_with_context-{$domain}` filter.
 *
 * @param string $single  The text to be used if the number is singular.
 * @param string $plural  The text to be used if the number is plural.
 * @param int    $number  The number to compare against to use either the singular or plural form.
 * @param string $context Context information for the translators.
 * @param string $domain  Optional. Text domain. Unique identifier for retrieving translated strings.
 *                        Default 'default'.
 * @return string The translated singular or plural form.
 */
function _nx( $single, $plural, $number, $context, $domain = 'default' ) {
	$translations = get_translations_for_domain( $domain );
	$translation  = $translations->translate_plural( $single, $plural, $number, $context );

	/**
	 * Filters the singular or plural form of a string with gettext context.
	 *
	 * @since 2.8.0
	 *
	 * @param string $translation Translated text.
	 * @param string $single      The text to be used if the number is singular.
	 * @param string $plural      The text to be used if the number is plural.
	 * @param int    $number      The number to compare against to use either the singular or plural form.
	 * @param string $context     Context information for the translators.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( 'ngettext_with_context', $translation, $single, $plural, $number, $context, $domain );

	/**
	 * Filters the singular or plural form of a string with gettext context for a domain.
	 *
	 * The dynamic portion of the hook name, `$domain`, refers to the text domain.
	 *
	 * @since 5.5.0
	 *
	 * @param string $translation Translated text.
	 * @param string $single      The text to be used if the number is singular.
	 * @param string $plural      The text to be used if the number is plural.
	 * @param int    $number      The number to compare against to use either the singular or plural form.
	 * @param string $context     Context information for the translators.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( "ngettext_with_context_{$domain}", $translation, $single, $plural, $number, $context, $domain );

	return $translation;
}

/**
 * Registers plural strings in POT file, but does not translate them.
 *
 * Used when you want to keep structures with translatable plural
 * strings and use them later when the number is known.
 *
 * Example:
 *
 *     $message = _n_noop( '%s post', '%s posts', 'text-domain' );
 *     ...
 *     printf( translate_nooped_plural( $message, $count, 'text-domain' ), number_format_i18n( $count ) );
 *
 * @since 2.5.0
 *
 * @param string $singular Singular form to be localized.
 * @param string $plural   Plural form to be localized.
 * @param string $domain   Optional. Text domain. Unique identifier for retrieving translated strings.
 *                         Default null.
 * @return array {
 *     Array of translation information for the strings.
 *
 *     @type string      $0        Singular form to be localized. No longer used.
 *     @type string      $1        Plural form to be localized. No longer used.
 *     @type string      $singular Singular form to be localized.
 *     @type string      $plural   Plural form to be localized.
 *     @type null        $context  Context information for the translators.
 *     @type string|null $domain   Text domain.
 * }
 */
function _n_noop( $singular, $plural, $domain = null ) {
	return array(
		0          => $singular,
		1          => $plural,
		'singular' => $singular,
		'plural'   => $plural,
		'context'  => null,
		'domain'   => $domain,
	);
}

/**
 * Registers plural strings with gettext context in POT file, but does not translate them.
 *
 * Used when you want to keep structures with translatable plural
 * strings and use them later when the number is known.
 *
 * Example of a generic phrase which is disambiguated via the context parameter:
 *
 *     $messages = array(
 *          'people'  => _nx_noop( '%s group', '%s groups', 'people', 'text-domain' ),
 *          'animals' => _nx_noop( '%s group', '%s groups', 'animals', 'text-domain' ),
 *     );
 *     ...
 *     $message = $messages[ $type ];
 *     printf( translate_nooped_plural( $message, $count, 'text-domain' ), number_format_i18n( $count ) );
 *
 * @since 2.8.0
 *
 * @param string $singular Singular form to be localized.
 * @param string $plural   Plural form to be localized.
 * @param string $context  Context information for the translators.
 * @param string $domain   Optional. Text domain. Unique identifier for retrieving translated strings.
 *                         Default null.
 * @return array {
 *     Array of translation information for the strings.
 *
 *     @type string      $0        Singular form to be localized. No longer used.
 *     @type string      $1        Plural form to be localized. No longer used.
 *     @type string      $2        Context information for the translators. No longer used.
 *     @type string      $singular Singular form to be localized.
 *     @type string      $plural   Plural form to be localized.
 *     @type string      $context  Context information for the translators.
 *     @type string|null $domain   Text domain.
 * }
 */
function _nx_noop( $singular, $plural, $context, $domain = null ) {
	return array(
		0          => $singular,
		1          => $plural,
		2          => $context,
		'singular' => $singular,
		'plural'   => $plural,
		'context'  => $context,
		'domain'   => $domain,
	);
}

/**
 * Translates and returns the singular or plural form of a string that's been registered
 * with _n_noop() or _nx_noop().
 *
 * Used when you want to use a translatable plural string once the number is known.
 *
 * Example:
 *
 *     $message = _n_noop( '%s post', '%s posts', 'text-domain' );
 *     ...
 *     printf( translate_nooped_plural( $message, $count, 'text-domain' ), number_format_i18n( $count ) );
 *
 * @since 3.1.0
 *
 * @param array  $nooped_plural {
 *     Array that is usually a return value from _n_noop() or _nx_noop().
 *
 *     @type string      $singular Singular form to be localized.
 *     @type string      $plural   Plural form to be localized.
 *     @type string|null $context  Context information for the translators.
 *     @type string|null $domain   Text domain.
 * }
 * @param int    $count         Number of objects.
 * @param string $domain        Optional. Text domain. Unique identifier for retrieving translated strings. If $nooped_plural contains
 *                              a text domain passed to _n_noop() or _nx_noop(), it will override this value. Default 'default'.
 * @return string Either $singular or $plural translated text.
 */
function translate_nooped_plural( $nooped_plural, $count, $domain = 'default' ) {
	if ( $nooped_plural['domain'] ) {
		$domain = $nooped_plural['domain'];
	}

	if ( $nooped_plural['context'] ) {
		return _nx( $nooped_plural['singular'], $nooped_plural['plural'], $count, $nooped_plural['context'], $domain );
	} else {
		return _n( $nooped_plural['singular'], $nooped_plural['plural'], $count, $domain );
	}
}

/**
 * Loads a .mo file into the text domain $domain.
 *
 * If the text domain already exists, the translations will be merged. If both
 * sets have the same string, the translation from the original value will be taken.
 *
 * On success, the .mo file will be placed in the $l10n global by $domain
 * and will be a MO object.
 *
 * @since 1.5.0
 * @since 6.1.0 Added the `$locale` parameter.
 *
 * @global MO[]                   $l10n                   An array of all currently loaded text domains.
 * @global MO[]                   $l10n_unloaded          An array of all text domains that have been unloaded again.
 * @global WP_Textdomain_Registry $wp_textdomain_registry WordPress Textdomain Registry.
 *
 * @param string $domain Text domain. Unique identifier for retrieving translated strings.
 * @param string $mofile Path to the .mo file.
 * @param string $locale Optional. Locale. Default is the current locale.
 * @return bool True on success, false on failure.
 */
function load_textdomain( $domain, $mofile, $locale = null ) {
	/** @var WP_Textdomain_Registry $wp_textdomain_registry */
	global $l10n, $l10n_unloaded, $wp_textdomain_registry;

	$l10n_unloaded = (array) $l10n_unloaded;

	if ( ! is_string( $domain ) ) {
		return false;
	}

	/**
	 * Filters whether to short-circuit loading .mo file.
	 *
	 * Returning a non-null value from the filter will effectively short-circuit
	 * the loading, returning the passed value instead.
	 *
	 * @since 6.3.0
	 *
	 * @param bool|null   $loaded The result of loading a .mo file. Default null.
	 * @param string      $domain Text domain. Unique identifier for retrieving translated strings.
	 * @param string      $mofile Path to the MO file.
	 * @param string|null $locale Locale.
	 */
	$loaded = apply_filters( 'pre_load_textdomain', null, $domain, $mofile, $locale );
	if ( null !== $loaded ) {
		if ( true === $loaded ) {
			unset( $l10n_unloaded[ $domain ] );
		}

		return $loaded;
	}

	/**
	 * Filters whether to override the .mo file loading.
	 *
	 * @since 2.9.0
	 * @since 6.2.0 Added the `$locale` parameter.
	 *
	 * @param bool        $override Whether to override the .mo file loading. Default false.
	 * @param string      $domain   Text domain. Unique identifier for retrieving translated strings.
	 * @param string      $mofile   Path to the MO file.
	 * @param string|null $locale   Locale.
	 */
	$plugin_override = apply_filters( 'override_load_textdomain', false, $domain, $mofile, $locale );

	if ( true === (bool) $plugin_override ) {
		unset( $l10n_unloaded[ $domain ] );

		return true;
	}

	/**
	 * Fires before the MO translation file is loaded.
	 *
	 * @since 2.9.0
	 *
	 * @param string $domain Text domain. Unique identifier for retrieving translated strings.
	 * @param string $mofile Path to the .mo file.
	 */
	do_action( 'load_textdomain', $domain, $mofile );

	/**
	 * Filters MO file path for loading translations for a specific text domain.
	 *
	 * @since 2.9.0
	 *
	 * @param string $mofile Path to the MO file.
	 * @param string $domain Text domain. Unique identifier for retrieving translated strings.
	 */
	$mofile = apply_filters( 'load_textdomain_mofile', $mofile, $domain );

	if ( ! $locale ) {
		$locale = determine_locale();
	}

	$i18n_controller = WP_Translation_Controller::get_instance();

	// Ensures the correct locale is set as the current one, in case it was filtered.
	$i18n_controller->set_locale( $locale );

	/**
	 * Filters the preferred file format for translation files.
	 *
	 * Can be used to disable the use of PHP files for translations.
	 *
	 * @since 6.5.0
	 *
	 * @param string $preferred_format Preferred file format. Possible values: 'php', 'mo'. Default: 'php'.
	 * @param string $domain           The text domain.
	 */
	$preferred_format = apply_filters( 'translation_file_format', 'php', $domain );
	if ( ! in_array( $preferred_format, array( 'php', 'mo' ), true ) ) {
		$preferred_format = 'php';
	}

	$translation_files = array();

	if ( 'mo' !== $preferred_format ) {
		$translation_files[] = substr_replace( $mofile, ".l10n.$preferred_format", - strlen( '.mo' ) );
	}

	$translation_files[] = $mofile;

	foreach ( $translation_files as $file ) {
		/**
		 * Filters the file path for loading translations for the given text domain.
		 *
		 * Similar to the {@see 'load_textdomain_mofile'} filter with the difference that
		 * the file path could be for an MO or PHP file.
		 *
		 * @since 6.5.0
		 *
		 * @param string $file   Path to the translation file to load.
		 * @param string $domain The text domain.
		 */
		$file = (string) apply_filters( 'load_translation_file', $file, $domain );

		$success = $i18n_controller->load_file( $file, $domain, $locale );

		if ( $success ) {
			if ( isset( $l10n[ $domain ] ) && $l10n[ $domain ] instanceof MO ) {
				$i18n_controller->load_file( $l10n[ $domain ]->get_filename(), $domain, $locale );
			}

			// Unset NOOP_Translations reference in get_translations_for_domain().
			unset( $l10n[ $domain ] );

			$l10n[ $domain ] = new WP_Translations( $i18n_controller, $domain );

			$wp_textdomain_registry->set( $domain, $locale, dirname( $file ) );

			return true;
		}
	}

	return false;
}

/**
 * Unloads translations for a text domain.
 *
 * @since 3.0.0
 * @since 6.1.0 Added the `$reloadable` parameter.
 *
 * @global MO[] $l10n          An array of all currently loaded text domains.
 * @global MO[] $l10n_unloaded An array of all text domains that have been unloaded again.
 *
 * @param string $domain     Text domain. Unique identifier for retrieving translated strings.
 * @param bool   $reloadable Whether the text domain can be loaded just-in-time again.
 * @return bool Whether textdomain was unloaded.
 */
function unload_textdomain( $domain, $reloadable = false ) {
	global $l10n, $l10n_unloaded;

	$l10n_unloaded = (array) $l10n_unloaded;

	/**
	 * Filters whether to override the text domain unloading.
	 *
	 * @since 3.0.0
	 * @since 6.1.0 Added the `$reloadable` parameter.
	 *
	 * @param bool   $override   Whether to override the text domain unloading. Default false.
	 * @param string $domain     Text domain. Unique identifier for retrieving translated strings.
	 * @param bool   $reloadable Whether the text domain can be loaded just-in-time again.
	 */
	$plugin_override = apply_filters( 'override_unload_textdomain', false, $domain, $reloadable );

	if ( $plugin_override ) {
		if ( ! $reloadable ) {
			$l10n_unloaded[ $domain ] = true;
		}

		return true;
	}

	/**
	 * Fires before the text domain is unloaded.
	 *
	 * @since 3.0.0
	 * @since 6.1.0 Added the `$reloadable` parameter.
	 *
	 * @param string $domain     Text domain. Unique identifier for retrieving translated strings.
	 * @param bool   $reloadable Whether the text domain can be loaded just-in-time again.
	 */
	do_action( 'unload_textdomain', $domain, $reloadable );

	// Since multiple locales are supported, reloadable text domains don't actually need to be unloaded.
	if ( ! $reloadable ) {
		WP_Translation_Controller::get_instance()->unload_textdomain( $domain );
	}

	if ( isset( $l10n[ $domain ] ) ) {
		if ( $l10n[ $domain ] instanceof NOOP_Translations ) {
			unset( $l10n[ $domain ] );

			return false;
		}

		unset( $l10n[ $domain ] );

		if ( ! $reloadable ) {
			$l10n_unloaded[ $domain ] = true;
		}

		return true;
	}

	return false;
}

/**
 * Loads default translated strings based on locale.
 *
 * Loads the .mo file in WP_LANG_DIR constant path from WordPress root.
 * The translated (.mo) file is named based on the locale.
 *
 * @see load_textdomain()
 *
 * @since 1.5.0
 *
 * @param string $locale Optional. Locale to load. Default is the value of get_locale().
 * @return bool Whether the textdomain was loaded.
 */
function load_default_textdomain( $locale = null ) {
	if ( null === $locale ) {
		$locale = determine_locale();
	}

	// Unload previously loaded strings so we can switch translations.
	unload_textdomain( 'default', true );

	$return = load_textdomain( 'default', WP_LANG_DIR . "/$locale.mo", $locale );

	if ( ( is_multisite() || ( defined( 'WP_INSTALLING_NETWORK' ) && WP_INSTALLING_NETWORK ) ) && ! file_exists( WP_LANG_DIR . "/admin-$locale.mo" ) ) {
		load_textdomain( 'default', WP_LANG_DIR . "/ms-$locale.mo", $locale );
		return $return;
	}

	if ( is_admin() || wp_installing() || ( defined( 'WP_REPAIRING' ) && WP_REPAIRING ) ) {
		load_textdomain( 'default', WP_LANG_DIR . "/admin-$locale.mo", $locale );
	}

	if ( is_network_admin() || ( defined( 'WP_INSTALLING_NETWORK' ) && WP_INSTALLING_NETWORK ) ) {
		load_textdomain( 'default', WP_LANG_DIR . "/admin-network-$locale.mo", $locale );
	}

	return $return;
}

/**
 * Loads a plugin's translated strings.
 *
 * If the path is not given then it will be the root of the plugin directory.
 *
 * The .mo file should be named based on the text domain with a dash, and then the locale exactly.
 *
 * @since 1.5.0
 * @since 4.6.0 The function now tries to load the .mo file from the languages directory first.
 *
 * @param string       $domain          Unique identifier for retrieving translated strings
 * @param string|false $deprecated      Optional. Deprecated. Use the $plugin_rel_path parameter instead.
 *                                      Default false.
 * @param string|false $plugin_rel_path Optional. Relative path to WP_PLUGIN_DIR where the .mo file resides.
 *                                      Default false.
 * @return bool True when textdomain is successfully loaded, false otherwise.
 */
function load_plugin_textdomain( $domain, $deprecated = false, $plugin_rel_path = false ) {
	/** @var WP_Textdomain_Registry $wp_textdomain_registry */
	global $wp_textdomain_registry;

	if ( ! is_string( $domain ) ) {
		return false;
	}

	/**