我正在尝试使用CodeignITers表单验证库,尽管我的验证规则似乎有效,但每当我调用validation_errors()时,我都会得到一个空字符串.

这是一段代码片段.

$base_rules = 'required|trim';

$this->_validation_rules = array(
        array(
            'field' => 'name','label' => 'name','rules' => $base_rules . '|alpha_numeric|min_length[5]|max_length[30]'
        ),array(
            'field' => 'PRice','label' => 'Price','rules' => $base_rules . '|decimal'
        ),array(
            'field' => 'duration','label' => 'Duration','rules' => $base_rules . '|integer'
        ),array(
            'field' => 'Booking','label' => 'Booking','rules' => $base_rules . '|integer'
        )
    );
    $this->form_validation->set_rules($this->_validation_rules);

    if ($this->form_validation->run()) {
        // do stuff
    }else{
        // prints an empty string
         var_dump(validation_errors());
         exit;
    }

有谁知道为什么会这样,我怎么能得到我的错误？

if ($this->form_validation->run()) {
        // do stuff
    }else{
       $this->load->view('myform'); //display your form again
    }