codignitor3 validation with custom password

 //user registration function 
public function registrationProcess()
{
    if(checkUsersession())
    {
        redirect('user');
    }
        $data['title'] = "Registration";
        $sitesetting = $this->my_model->getData('tblsetting',$resultType = 'row_array',$arg=[]);
        $data['countries'] = $this->my_model->getData('tblcountries',$resultType = 'result_array',$arg=[]);
        $data['sitename'] = $sitesetting['sitename'];
        $data['sitelogo'] = $sitesetting['logo'];
        $data['sitefavicon'] = $sitesetting['favicon'];
        $data['metakeyword'] = $sitesetting['metakeyword'];
        $data['contactphone'] = $sitesetting['contactphone'];
        $data['contactemail'] = $sitesetting['contactemail'];
        $data['logo'] = $sitesetting['logo'];
        $data['contactaddress'] = $sitesetting['contactaddress'];
        $data['metadescription'] = $sitesetting['metadescription'];
        $data['footercopyright'] = $sitesetting['footercopyright'];
        $data['facebooklink'] = $sitesetting['facebooklink'];
    $data['twitterlink'] = $sitesetting['twitterlink'];
    $data['linkedinlink'] = $sitesetting['linkedinlink'];
    $data['googlelink'] = $sitesetting['googlelink'];
    $data['pinterestlink'] = $sitesetting['pinterestlink'];
$data['blogs'] = $this->my_model->getData('tblblog',$resultType = 'result_array',$arg=['select'=>['id','title','image'],'order'=>['col'=>'id','type'=>'DESC'],'limit'=>['upto'=>'5']]);
    $data['footercharity'] = $this->my_model->getData('tblcharity',$resultType = 'result_array',$arg=['select'=>['id','name','image'],'order'=>['col'=>'id','type'=>'DESC'],'limit'=>['upto'=>'3']]);
        $data['footerblog'] = $this->my_model->getData('tblblog',$resultType = 'result_array',$arg=['select'=>['id','title','image'],'order'=>['col'=>'id','type'=>'DESC'],'limit'=>['upto'=>'3']]);
    if (isset($_POST['g-recaptcha-response']))
    {
        $secret = '6Le2q64ZAAAAAKSgsvzNMLLTi5g770Umcvd-NUfm';
            $verifyResponse = file_get_contents('https://www.google.com/recaptcha/api/siteverify?secret='.$secret.'&response='.$_POST['g-recaptcha-response']);
            $responseData = json_decode($verifyResponse);
            if($responseData->success)
            {
            $this->form_validation->set_rules('firstname', 'First Name','trim|required');
            $this->form_validation->set_rules('lastname', 'Last Name','trim|required');
            $this->form_validation->set_rules('email', 'Email','trim|required|is_unique[tbluser.email]');
            $this->form_validation->set_rules('phone', 'Phone Number','trim|regex_match[/^[+]?\d+$/]');
            $this->form_validation->set_rules('address', 'Address','trim');
            $this->form_validation->set_rules('country', 'Country','trim|required');
            $this->form_validation->set_rules('city', 'City','trim');
            $this->form_validation->set_rules('zipcode', 'Zip Code','trim');
            $this->form_validation->set_rules('state', 'State','trim');
            $this->form_validation->set_rules('password','Password','trim|required|alpha_numeric|callback_valid_password');
                $this->form_validation->set_rules('repassword', 'Retype Password','trim|required|matches[password]|alpha_numeric');
                
        if ($this->form_validation->run() == FALSE)
                {
        $this->load->view('user/register',$data);
                }
                else
                {
                $email = $this->input->post('email');
                $password = $this->input->post('password');
        $return = sendMailfunction($email);
        if($return)
        {
            $insertiondata = [
                'email' => $this->input->post('email'),
                'firstname' => $this->input->post('firstname'),
                'lastname' => $this->input->post('lastname'),
                'phone' => $this->input->post('phone'),
                'address' => $this->input->post('address'),
                'country' => $this->input->post('country'),
                'city' => $this->input->post('city'),
                'zip-code' => $this->input->post('zipcode'),
                'state' => $this->input->post('state'),
                'password' => base64_encode($this->input->post('password')),
                'isverified' => '0',
                'isblocked' => '1',
                'created' => date('Y:m:d'),
                ];
           
            if(!$this->my_model->insertData('tbluser',$insertiondata))
            {
            $this->session->set_flashdata('insertionsuccess','Your account is created. A verification link has been sent to your email. Please check your inbox or spam folder.');
            redirect('user/register');
            }
            else
            {
                $this->session->set_flashdata('insertionerror','Something went wrong! try again');
            $this->load->view('user/register',$data);
            }
        }
        else
        {
        $this->session->set_flashdata('insertionerror','Something went wrong ! try again');
        $this->load->view('user/register',$data);
        }
                }
            }
            else
            {   
                $data['capchtaerror'] = "Please verify yourself ! you are not a robot";
                $this->load->view('user/register',$data);
            }
    }
    else
    {
            $data['capchtaerror'] = "Please verify yourself ! you are not a robot";
            $this->load->view('user/register',$data);
    }
}
    //custom password function
public function valid_password($password = '')
    {
        $password = trim($password);
        $regex_lowercase = '/[a-z]/';
        $regex_uppercase = '/[A-Z]/';
        $regex_number = '/[0-9]/';
        $regex_special = '/[!@#$%^&*()\-_=+{};:,<.>§~]/';
        if (empty($password))
        {
            $this->form_validation->set_message('valid_password', 'The {field} field is required.');
            return FALSE;
        }
        if (preg_match_all($regex_lowercase, $password) < 1)
        {
            $this->form_validation->set_message('valid_password', 'The {field} field must be at least one lowercase letter.');
            return FALSE;
        }
        if (preg_match_all($regex_uppercase, $password) < 1)
        {
            $this->form_validation->set_message('valid_password', 'The {field} field must be at least one uppercase letter.');
            return FALSE;
        }
        if (preg_match_all($regex_number, $password) < 1)
        {
            $this->form_validation->set_message('valid_password', 'The {field} field must have at least one number.');
            return FALSE;
        }
        // if (preg_match_all($regex_special, $password) < 1)
        // {
        //     $this->form_validation->set_message('valid_password', 'The {field} field must have at least one special character.' . ' ' . htmlentities('!@#$%^&*()\-_=+{};:,<.>§~'));
        //     return FALSE;
        // }
        if (strlen($password) < 8)
        {
            $this->form_validation->set_message('valid_password', 'The {field} field must be at least 8 characters in length.');
            return FALSE;
        }
        if (strlen($password) > 32)
        {
            $this->form_validation->set_message('valid_password', 'The {field} field cannot exceed 32 characters in length.');
            return FALSE;
        }
        return TRUE;
    }

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