CodeIgniter Strong Password Validation

Access.php

<?php
/**
 * @author   Natan Felles <natanfelles@gmail.com>
 */
defined('BASEPATH') or exit('No direct script access allowed');

/**
 * Class Access
 */
class Access extends CI_Controller {


	public function __construct()
	{
		parent::__construct();
	}


	public function create_account()
	{
		if ($this->input->post())
		{
			$this->load->library('form_validation');
			$rules = array(
				[
					'field' => 'password',
					'label' => 'Password',
					'rules' => 'callback_valid_password',
				],
				[
					'field' => 'repeat_password',
					'label' => 'Repeat Password',
					'rules' => 'matches[password]',
				],
			);
			$this->form_validation->set_rules($rules);
			if ($this->form_validation->run())
			{
				echo 'Success! Account can be created.';
			}
			else
			{
				echo 'Error! <ul>' . validation_errors('<li>', '</li>') . '</ul>';
			}
		}
		// Load your views
	}


	/**
	 * Validate the password
	 *
	 * @param string $password
	 *
	 * @return bool
	 */
	public function valid_password($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) < 5)
		{
			$this->form_validation->set_message('valid_password', 'The {field} field must be at least 5 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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