无法在CodeIgniter中查看面向错误的表单页面

Question

这是我在此控制器中的 home.php 文件我面临致命错误：Uncaught ArgumentCountError： 我还附了一个截图，在这个截图错误中提到，你可以通过这个截图轻松理解错误，我是CodeIgniter的新手。 [ 我只上传我的控制器相关文件。

<?php

class home extends CI_Controller {

    function __construct() {
        parent::__construct();
        $this->load->model('select');
        $this->load->helper(array('form', 'url', 'html'));
        $this->load->library(array('form_validation', 'session'));
    }

    function records() {
        $ytl['dta'] = $this->users->datas();
        //$this->load->view('info',$ytl);
        //echo "<pre>controller";print_r($ytl);
    }

    function primezone() {
        $ytl['dta'] = $this->users->datas();
        echo "<pre>controller";
        print_r($ytl);
    }

    function form($id) {
        //die($id);
        if ($this->input->post()) {
            //echo"<pre>";print_r( $this->input->post());die;
            $this->form_validation->set_rules('fname', 'First Name', 'required|min_length[5]');
            $this->form_validation->set_rules('lname', 'Last Name', 'required|callback_check_picture[lname]');

            //$this->form_validation->set_rules('email','Email','required');

            $this->form_validation->set_rules('mobile', 'Mobile Number', 'required|callback_valid_phone_number[mobile]');

            $this->form_validation->set_error_delimiters('<h1 class="error">', '</h1>');
            if ($this->form_validation->run() == TRUE) {
                $data = [

                    'fname'   => $this->input->post('fname'),
                    'lname'   => $this->input->post('lname'),
                    'email'   => $this->input->post('email'),
                    'mobile'  => $this->input->post('mobile'),
                    'message' => $this->input->post('message'),
                ];
                if (empty($id)) {
                    $ytl = $this->select->insertdata($data);

                } else {
                    $ytl = $this->select->updatedata($data, $id);
                }
                if ($ytl) {
                    $this->session->set_flashdata('message', 'Successfully Added.');
                    redirect('home');
                }
            } else {
                //$this->load->view('form');
            }
        }
        $ytl['dta'] = $this->select->getDataById($id);
        //echo "<pre>";print_r($ytl);die;
        $this->load->view('form', $ytl);
    }

    public function check_picture($a) {
        if ( ! is_numeric($a)) {
            return TRUE;
        } else {
            $this->form_validation->set_message('check_picture', 'Please enter only char value');

            return FALSE;
        }
    }

    function valid_phone_number($value) {
        $value = strlen($value);
        //echo $value;die;
        if ($value == 10) {
            return TRUE;
        } else {
            $this->form_validation->set_message('valid_phone_number', 'Mobile number not in range'); //{10} 

            return FALSE;
        }
    }

    public function index() {
        //load the database  
        //$this->load->database();  
        //load the model  
        $this->load->model('select');
        //load the method of model  
        $data['h'] = $this->select->select();
        //return the data in view  
        $this->load->view('fetch_view', $data);
    }

    public function delete() {
        $this->load->model('select');
        $id = $this->input->get('id');
        if ($this->select->deleteuser($id)) {
            $data['data'] = $this->select->getuser();
            $this->load->view('fetch_view', $data);
        }
    }
} 

Answer 1

在控制器功能中设置默认id值，如

function form($id = null){
....
}

Answer 2

您提到的错误通常是在param提及function和传递的错误时出现的错误。

根据你的代码 public function form($id) $id是必需的，你没有通过它。

所以将代码更改为

public function form($id=null)