CI登录验证

 

预先加载数据库操作类和Session类 即在autoload.php中,$autoload['libraries'] = array('database', 'session');

a. 注: 使用session , 要设定 encryption key : config.php中:  $config['encryption_key'] = '!@#$%^&*()';

登录表单页(view) : login_view.php

注: 由于该页面使用了CI的form标签, 所以需要在渲染该页面前加载form_helper, 即: 在config/autoload.php, 文件中加入: $autoload['helper'] = array('url', 'form'); 

html代码:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="utf-8">
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<title>Login</title>
<style>div{display: block;} .errors{color: red;}</style>
</head>
<body>
<h1>Please Login</h1>
<?php echo form_open('admin');?>
<p>
<?php 
  echo form_label('Email: ', 'email');
  echo form_input('email', set_value('email'), 'id="email" autofocus'); // set_value 如果密码输入有误, 返回时,默认写入值
?>
</p>
<p>
<?php 
  echo form_label('Password: ', 'password');
  echo form_input('password', '', 'id="password"');
?>
</p>
<p>
<?php echo form_submit('submit','Login');?>
</p>
<?php echo form_close();?>

<div class="errors"><?php echo validation_errors();?></div>
</body>

</html>
 
  
 admin.php控制器 php代码:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Admin extends CI_Controller {

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

  public function index(){

    // 在welcome的action中添加如下代码,即可用户登录情况
    /**
    * public function __costruct(){
    *       session_start();
    *    parent::_construct();
    * 
    *       if(!$this->session->userdata('username')) redirect('admin');
    * }
    */
    if ($this->session->userdata('username')) {
      redirect('welcome');
    }

    $this->load->library('form_validation'); // 使用CI的表单验证, 如下:
    $this->form_validation->set_rules('email', 'Email', 'valid_email|required');
    $this->form_validation->set_rules('password', 'Password', 'min_length[4]|required');

    if($this->form_validation->run() !== false){
      // then validate password. Get from the Db.
      $this->load->model('admin_model');
      $res = $this->admin_model->verify_users(
        $this->input->post('email'),
        $this->input->post('password')
      );
      if($res !== false){
        print_r($res);
        $this->session->set_userdata('username', $this->input->post('email'));
        redirect('welcome'); 
      }
    }

    $this->load->view('login_view');
  }

  public function logout(){
    $this->session->sess_destroy();
    $this->load->view('login_view');
  }

}
 
  
 admin_model.php模型 php代码: 


<?php
class Admin_model extends CI_Model{

  function verify_users($email, $password){
    $q = $this->db
      ->where('email', $email)
      ->where('password', sha1($password))
      ->limit(1)->get('users');

    if($q->num_rows > 0){
      return $q->row();
    }
    return false;
  }
}

CI登录验证_第1张图片

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