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<?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 longe