/**
* Returns a singleton reference of this class.
*
* @author Stefan Herndler
* @since 1.0.0
* @return WPT_Storage
*/
public static function singleton()
{
// initialize singleton if first call
if (!self::$a_obj_Singleton instanceof WPT_Storage) {
self::$a_obj_Singleton = new self();
}
// return the singleton of this class
return self::$a_obj_Singleton;
}
/**
* Loads and initializes the internal storage.
*
* @author Stefan Herndler
* @since 1.0.0
*/
private function loadInternalStorage()
{
// require the class which handles the internal storage
require_once dirname(__FILE__) . '/Storage.php';
// get the singleton once to call the constructor and initialize the class
WBR_Storage::singleton();
}
/**
* Returns the language code (2 characters) in all lowercase used for translations.
* The language code is determined using the following priority:
* 1) internal storage (manually set by the visitor itself)
* 2) specified by WPML plugin if installed and activated
* 3) using the browser's locale
*
* @author Stefan Herndler
* @since 1.0.0
* @return string
*/
private function determineLanguageCode()
{
// check if language code is specified in the internal storage (manually switched by the visitor)
$l_str_LanguageCode = WBR_Storage::singleton()->readLanguageCode();
if (strlen($l_str_LanguageCode) === 2) {
return $l_str_LanguageCode;
}
// get the language code of the optional WordPress plugin 'WPML' if plugin is activated
if (defined('ICL_LANGUAGE_CODE') && strlen(ICL_LANGUAGE_CODE) === 2) {
return strtolower(strval(ICL_LANGUAGE_CODE));
}
// extract the locale specified by the http header (browser)
$l_arr_Locale = explode(",", $_SERVER['HTTP_ACCEPT_LANGUAGE']);
// check if locale is specified in the browser
if (count($l_arr_Locale) === 0) {
// no locale specified, return the default value
return WPT_CONFIG_DEFAULT_LANGUAGE_CODE;
}
// extract the locale from the browser variable
$l_str_Locale = $l_arr_Locale[0];
// check if locale is split by an underscore
if (strlen($l_str_Locale) === 5 && strpos($l_str_Locale, "_") !== false) {
// extract the language code out of the locale
return strtolower(explode('_', $l_str_Locale)[0]);
}
// check if locale is split by a minus
if (strlen($l_str_Locale) === 5 && strpos($l_str_Locale, "-") !== false) {
// extract the language code out of the locale
return strtolower(explode('-', $l_str_Locale)[0]);
}
// unknown separator of language code and country code inside the locale
// either the browser's locale is already the language code (only 2 characters) otherwise the default language will be used
return strlen($l_str_Locale) === 2 ? strtolower($l_str_Locale) : WBR_CONFIG_DEFAULT_LANGUAGE_CODE;
}