How to validate fields - codeigniter

Question

I want to insert validate data into database.
My code is like below, where submit is my button name and name, email, mobile is my form fields:
if($this->input->post('submit'))
{
$name = $this->input->post('name');
$email = $this->input->post('email');
$mobile = $this->form_validation->set_rules('mobile', 'Mobile','trim|required|numeric');
$query = $this->my_model->insertdata($name, $email, $mobile);
}
How can I validate form fields if I have written code like above?

Answer 1

You should use Form Validation Library.
First, autoload it:
Open application/config/autoload.php and edit line 61 like below:
$autoload['libraries'] = array('form_validation');
Now, you can validate your form in your controller. Here is an example for you:
public function some_function()
{
$this->form_validation->set_rules('input_name', 'input human name', 'required');
if ($this->form_validation->run() === false)
{
//return some error here
}
else
{
// send data to your model (e.g. $this->Some_model->some_function())
}
}
Please see Form Validation Library Guide to see all references and examples. Also please follow this order for submitting forms: View -> Controller -> Model.

Answer 2

first, you are putting insecure data into your database.
$data = [
'name' => html_escape($this->input->post('name'),
'email' => html_escape($this->input->post('email'),
'mobile' => html_escape($this->input->post('mobile');
];
$this->form_validation->set_rules('mobile',Mobile','trim|required|numeric');
$this->form_validation->set_rules('name',name','trim|required');
$this->form_validation->set_rules('email',Email','trim|required|valid_email');
if ($this->form_validation->run() === false)
{
//print error
}else
{
$this->db->insert('TABLE', $data);
}

Answer 3

public function register()
{
$this->form_validation->set_rules('username', 'Usename Name', 'trim|required|min_length[3]|max_length[30]');
$this->form_validation->set_rules('email', 'Email ID', 'trim|required|valid_email|is_unique[jobseeker_registration.email]');
$this->form_validation->set_rules('mobile', 'Mobile', 'trim|required|numeric');
if ($this->form_validation->run() === false)
{ $this->load->view('register'); }
else
{
$data = array(
'name' => $this->input->post('name'),
'username' => $this->input->post('username'),
'email' => $this->input->post('email'),
'mobile' => $this->input->post('mobile'),
'password' => $this->input->post('password')
);
$this->Jobseeker_model->insertdata($data)
}
}
This code is work for me very well for form validation