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<?php

/**
 * Determine the current locale desired for the request.
 *
 * @since 5.0.0
 *
 * @global string $pagenow
 *
 * @return string The determined locale.
 */
if ( ! function_exists( 'determine_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 The locale to return and short-circuit, or null as default.
		 */
		$determined_locale = apply_filters( 'pre_determine_locale', null );
		if ( ! empty( $determined_locale ) && is_string( $determined_locale ) ) {
			return $determined_locale;
		}

$determined_locale = get_locale();

if ( function_exists( 'get_user_locale' ) && is_admin() ) {
			$determined_locale = get_user_locale();
		}

// phpcs:disable WordPress.Security.NonceVerification.Recommended -- Copied from WordPress core.
		if ( function_exists( 'get_user_locale' ) && isset( $_GET['_locale'] ) && 'user' === $_GET['_locale'] ) {
			$determined_locale = get_user_locale();
		}

if ( ! empty( $_GET['wp_lang'] ) && ! empty( $GLOBALS['pagenow'] ) && 'wp-login.php' === $GLOBALS['pagenow'] ) {
			$determined_locale = sanitize_text_field( $_GET['wp_lang'] );
		}
		// phpcs:enable WordPress.Security.NonceVerification.Recommended

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

/**
 * Returns the current locale.
 *
 * @date    16/12/16
 * @since   5.5.0
 *
 * @param   void
 * @return  string
 */
function acf_get_locale() {

// Determine local.
	$locale = determine_locale();

// Fallback to parent language for regions without translation.
	// https://wpastra.com/docs/complete-list-wordpress-locale-codes/
	$langs = array(
		'az_TR' => 'az',        // Azerbaijani (Turkey)
		'zh_HK' => 'zh_TW',     // Chinese (Hong Kong)
		'fr_BE' => 'fr_FR',     // French (Belgium)
		'nn_NO' => 'nb_NO',     // Norwegian (Nynorsk)
		'fa_AF' => 'fa_IR',     // Persian (Afghanistan)
		'ru_UA' => 'ru_RU',     // Russian (Ukraine)
	);
	if ( isset( $langs[ $locale ] ) ) {
		$locale = $langs[ $locale ];
	}

/**
	 * Filters the determined local.
	 *
	 * @date    8/1/19
	 * @since   5.7.10
	 *
	 * @param   string $locale The local.
	 */
	return apply_filters( 'acf/get_locale', $locale );
}

/**
 * acf_load_textdomain
 *
 * Loads the plugin's translated strings similar to load_plugin_textdomain().
 *
 * @date    8/1/19
 * @since   5.7.10
 *
 * @param   string $locale The plugin's current locale.
 * @return  void
 */
function acf_load_textdomain( $domain = 'acf' ) {

/**
	 * Filters a plugin's locale.
	 *
	 * @date    8/1/19
	 * @since   5.7.10
	 *
	 * @param   string $locale The plugin's current locale.
	 * @param   string $domain Text domain. Unique identifier for retrieving translated strings.
	 */
	$locale = apply_filters( 'plugin_locale', acf_get_locale(), $domain );
	$mofile = $domain . '-' . $locale . '.mo';

// Load from plugin lang folder.
	return load_textdomain( $domain, acf_get_path( 'lang/' . $mofile ) );
}

/**
 * _acf_apply_language_cache_key
 *
 * Applies the current language to the cache key.
 *
 * @date    23/1/19
 * @since   5.7.11
 *
 * @param   string $key The cache key.
 * @return  string
 */
function _acf_apply_language_cache_key( $key ) {

// Get current language.
	$current_language = acf_get_setting( 'current_language' );
	if ( $current_language ) {
		$key = "{$key}:{$current_language}";
	}

// Return key.
	return $key;
}

// Hook into filter.
add_filter( 'acf/get_cache_key', '_acf_apply_language_cache_key' );