Codeigniter检测表单post数据的方法

$name = $this->input->post(' name' ) ;$email = $this- >input->post( ' email' ) ;$subj ect = $this->input->post( ' subject' ) ;$message = $this->input->post( ' message' ) ;if(empty($name) OR empty($email) OR empty($subject) OR empty($message)){ show_404 ("Please go back and fill in all of the fields. " ) ;}