private static function uploadDir()
{
if (empty(self::$wp_upload_dir)) {
self::$wp_upload_dir = wp_upload_dir();
}
return self::$wp_upload_dir;
}
/**
* Clear the internally cached upload dir. WP Thumb cached the results of wp_upload_dir()
* for performance, however it's sometimes necessary to clear the internal cache, such as switching
* blogs in multisite
*/
public static function clearUploadDirCache()
{
self::$wp_upload_dir = null;
}
