php - fatal error : Call to undefined function form_open() line 104

Question

我知道你们大多数人都会意识到这是一个愚蠢的问题，但我不知道我的代码有什么问题。我正在尝试创建一个将发送到数据库的联系表单。但是当我尝试访问 contact_form_view.php 时，它显示 fatal error :在第 104 行调用未定义的函数 form_open()

这是表单代码

<?php $attributes = array("name" => "contactform");
        echo form_open("contactform/index", $attributes);?>
        <div class="form-group">
            <label for="name">Name</label>
            <input class="form-control" name="name" placeholder="Your Full Name" type="text" value="<?php echo set_value('name'); ?>" />
            <span class="text-danger"><?php echo form_error('name'); ?></span>
        </div>

        <div class="form-group">
            <label for="email">Email ID</label>
            <input class="form-control" name="email" placeholder="Email-ID" type="text" value="<?php echo set_value('email'); ?>" />
            <span class="text-danger"><?php echo form_error('email'); ?></span>
        </div>

        <div class="form-group">
            <label for="subject">Subject</label>
            <input class="form-control" name="subject" placeholder="Subject" type="text" value="<?php echo set_value('subject'); ?>" />
            <span class="text-danger"><?php echo form_error('subject'); ?></span>
        </div>

        <div class="form-group">
            <label for="message">Message</label>
            <textarea class="form-control" name="message" rows="4" placeholder="Message"><?php echo set_value('message'); ?></textarea>
            <span class="text-danger"><?php echo form_error('message'); ?></span>
        </div>

        <div class="form-group">
            <button name="submit" type="submit" class="btn btn-success">Submit</button>
        </div>
        <?php echo form_close(); ?>
        <?php echo $this->session->flashdata('msg'); ?>

这是PHP代码

<?php
class contactform extends CI_Controller
{
   public function __construct()
   {
        parent::__construct();
       $this->load->helper(array('form','url'));
       $this->load->library(array('session', 'form_validation'));
       $this->load->database();
   }

   function index()
   {
        //set validation rules
        $this->form_validation->set_rules('name',   'Name',                     'trim|required|xss_clean|callback_alpha_space_only');
        $this->form_validation->set_rules('email', 'Emaid ID', 'trim|required|valid_email');
        $this->form_validation->set_rules('subject', 'Subject', 'trim|required|xss_clean');
        $this->form_validation->set_rules('message', 'Message', 'trim|required|xss_clean');

        //run validation on post data
        if ($this->form_validation->run() == FALSE)
        {   //validation fails
            $this->load->view('contact_form_view');
        }
        else
        {
            //insert the contact form data into database
            $data = array(
                'name' => $this->input->post('name'),
                'email' => $this->input->post('email'),
                'subject' => $this->input->post('subject'),
                'message' => $this->input->post('message')
            );

            if ($this->db->insert('contacts', $data))
            {
                // success
                $this->session->set_flashdata('msg','<div class="alert alert-success text-center">We received your message! Will get back to you shortly!!!</div>');
                redirect('contactform/index');
            }
            else
            {
                // error
                $this->session->set_flashdata('msg','<div class="alert alert-danger text-center">Oops! Some Error.  Please try again later!!!</div>');
                redirect('contactform/index');
            }
        }
    }

    //custom callback to accept only alphabets and space input
    function alpha_space_only($str)
    {
        if (!preg_match("/^[a-zA-Z ]+$/",$str))
        {
            $this->form_validation->set_message('alpha_space_only', 'The %s field must contain only alphabets and space');
            return FALSE;
        }
        else
        {
            return TRUE;
        }
    }
}
?>

Answer 1

如果您尝试像这样在 autoload.php 中加载表单助手

$autoload['helper'] = array('url', 'form');

我认为您在 Controller 中加载了帮助程序，该 Controller 具有表单的操作，而不是调用表单的 Controller 。

所以只需将助手添加到 autoload.php 即可工作