Unable to view Form page in CodeIgniter facing Error - php

Question

This is my home.php file in this controller I am facing Fatal error: Uncaught ArgumentCountError:
I have also attached a screenshot, In this screenshot error mentioned, You can easily understand the error through this screenshot, I am newbie in CodeIgniter.
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I upload only my controller related file.
<?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

The error you have mention is normally came when there is mismatch in param mention in function and the passing ones.
According to your code
public function form($id)
$id is required and you are not passing that.
So change your code to
public function form($id=null)

Answer 2

Set default id value in your controller function like
function form($id = null){
....
}