private function _get_file_extension()
    {

        if (empty($this->u_mime_type)) return false;

        $tmp                  = explode('/', $this->u_mime_type);
        $this->file_extension = array_pop($tmp);

        unset($tmp);

        return true;
    }
private function _get_file_extension()
    {

        if (empty($this->u_mime_type)) return false;

        $tmp                  = explode('/', $this->u_mime_type);
        $this->file_extension = array_pop($tmp);

        unset($tmp);

        return true;
    }
private function _get_file_extension ( ) { if ( empty ( $ this -> u_mime_type ) ) return false ; $ tmp = explode ( '/' , $ this -> u_mime_type ) ; $ this -> file_extension = array_pop ( $ tmp ) ; unset ( $ tmp ) ; return true ; }
gets the suffix for the file that has been uploaded

@return bool
gets the suffix for the file that has been uploaded