Form validation don't work

As Wouter60 pointed out, both fields are named password

Code:

<input name="password" value="" id="password_id" type="text">
<input name="password" value="" id="password_id" type="text">

Both fields also have the same ID. ID's in HTML must always be unique.
Besides being required, repeat password should also be set to match the password field

Code:

<input name="password" value="" id="password_id" type="text">
<input name="password_repeat" value="" id="password_repeat_id" type="text">

And set your rules like this

PHP Code:

$this->form_validation->set_rules('password', 'Password', 'required');
$this->form_validation->set_rules('password_repeat', 'Password Confirmation', 'required|matches[password]'); 


Example from documentation
https://www.codeigniter.com/user_guide/l...ding-rules