function login($xh,$pwd){
        $url = 'http://jw.hzau.edu.cn/default2.aspx';
        $post['__VIEWSTATE'] = $this->getView();
        $post['txtUserName'] = $xh; //填写学号
        $post['TextBox2'] = $pwd;  //填写密码
        $post['txtSecretCode'] = '';
        $post['lbLanguage'] = '';
        $post['hidPdrs'] = '';
        $post['hidsc'] = '';
        $post['RadioButtonList1'] = iconv('utf-8', 'gb2312', '学生');
        $post['Button1'] = iconv('utf-8', 'gb2312', '登录');
        $result = curl_request($url,$post,'', 1);
        return $result['cookie'];
    }

//返回课表字符串
private function classresult($xh,$pwd){
        date_default_timezone_set("PRC"); //时区设置
        $classList = "";//声明课表变量

        $cookie = $this->login($xh,$pwd);
        $view = $this->getViewJs($cookie,$xh);//验证密码是否正确

        //如果密码正确
        if (!empty($view)) {
            $url = "http://jw.hzau.edu.cn/xskbcx.aspx?xh={$xh}";
            $result = curl_request($url,'',$cookie);  //保存的cookies
            preg_match_all('/<table id="Table1"[\w\W]*?>([\w\W]*?)<\/table>/',$result,$out);
            $table = $out[0][0]; //获取整个课表

            preg_match_all('/<td [\w\W]*?>([\w\W]*?)<\/td>/',$table,$out);
            $td = $out[1];
            $length = count($td);

            //获得课程列表
            for ($i=0; $i < $length; $i++) { 
                $td[$i] = str_replace("<br>", "", $td[$i]);

                $reg = "/{(.*)}/";
            
                if (!preg_match_all($reg, $td[$i], $matches)) {
                    unset($td[$i]);
                }
            }

            $td = array_values($td); //将课程列表数组重新索引
            $tdLength = count($td);
            for ($i=0; $i < $tdLength; $i++) { 
                $td[$i] = iconv('GB2312','UTF-8',$td[$i]);
            }

            //将课表转换成数组形式
            function converttoTable($table){
                $list = array(
                    'sun' => array(
                        '1,2' => '',
                        '3,4' => '',
                        '5,6' => '',
                        '7,8' => '',
                        '9,10' => ''
                    ),
                    'mon' => array(
                        '1,2' => '',
                        '3,4' => '',
                        '5,6' => '',
                        '7,8' => '',
                        '9,10' => ''
                    ),
                    'tues' => array(
                        '1,2' => '',
                        '3,4' => '',
                        '5,6' => '',
                        '7,8' => '',
                        '9,10' => ''
                    ),
                    'wed' => array(
                        '1,2' => '',
                        '3,4' => '',
                        '5,6' => '',
                        '7,8' => '',
                        '9,10' => ''
                    ),
                    'thur' => array(
                        '1,2' => '',
                        '3,4' => '',
                        '5,6' => '',
                        '7,8' => '',
                        '9,10' => ''
                    ),
                    'fri' => array(
                        '1,2' => '',
                        '3,4' => '',
                        '5,6' => '',
                        '7,8' => '',
                        '9,10' => ''
                    ),
                    'sat' => array(
                        '1,2' => '',
                        '3,4' => '',
                        '5,6' => '',
                        '7,8' => '',
                        '9,10' => ''
                    )
                );
                $week = array("sun"=>"周日","mon"=>"周一","tues"=>"周二","wed"=>"周三","thur"=>"周四","fri"=>"周五","sat"=>"周六");
                $order = array('1,2','3,4','5,6','7,8','9,10');
                foreach ($table as $key => $value) {
                    $class = $value;
                    foreach ($week as $key => $weekDay) {
                        $pos = strpos($class,$weekDay);
                        // echo $pos;
                        if ($pos) {
                            $weekArrayDay = $key; //获取list数组中的第一维key 
                            foreach ($order as $key => $orderClass) {
                                $pos = strpos($class,$orderClass);
                                if ($pos) {
                                    $weekArrayOrder = $orderClass; //获取该课程是第几节
                                    break;
                                }
                            }
                            break;
                        }
                    }
                    $list[$weekArrayDay][$weekArrayOrder] = $class;
                }
                return $list;
            }
                    
            //调用函数
            return converttoTable($td);
        }else{
            return 0;
        }
    }

//空教室查询结果
public function roomresult(){
    $xh = ""; //设置学号
    $pwd = "";  //学号对应的密码

    $cookie = $this->login($xh,$pwd);
    $url = "http://jw.hzau.edu.cn/xs_main.aspx?xh={$xh}";
    $result = curl_request($url,'',$cookie);  //保存的cookies

    $url="http://jw.hzau.edu.cn/xxjsjy.aspx?xh={$xh}";
    $post['Button2'] = iconv('utf-8', 'gb2312', '空教室查询');
    $post['__EVENTARGUMENT']='';
    $post['__EVENTTARGET']='';
    $post['__VIEWSTATE'] = $this->getViewJs($cookie,$xh);
    $post['ddlDsz'] = iconv('utf-8', 'gb2312', '单');
    $post['ddlSyXn'] = '2014-2015'; //学年
    $post['ddlSyxq'] = '1'; 
    $post['jslb'] = '';
    $post['xiaoq'] = '';

    $post['kssj']=$_GET['start'];  //提交的开始查询时间  
    $post['sjd']=$_GET['class'];//提交的课程节次

    $post['xn']='2014-2015';//所在学年
    $post['xq']='2';//所在学期
    $post['xqj']='6';//当天星期几
    $post['dpDataGrid1:txtPageSize']=90;//每页显示条数

    $result = curl_request($url,$post,$cookie,0);
    
    preg_match_all('/<span[^>]+>[^>]+span>/',$result,$out);
    $tip = iconv('gb2312', 'utf-8', $out[0][3]);//获取页面前部的提示内容
    preg_match_all('/<table[\w\W]*?>([\w\W]*?)<\/table>/',$result,$out);
    $table = iconv('gb2312', 'utf-8', $out[0][0]); //获取查询列表
    
    $this->load->view("classroom",array('tip'=>$tip,'table'=>$table));
}

public function index($p=0){
    echo $p;
}

public function showusers(){
//装载数据库操作类
$this->load->database();

//装载成功之后会放入超级对象的属性中，默认属性名是db/
//var_dump($this->db);

$sql = "select * from blog_user";

//返回一个对象
$res = $this->db->query($sql); // mysql_query()

//var_dump($res); //返回值是一个对象

$users = $res->result(); 

//mysql_fetch_object(); 返回对象
//mysql_fetch_assoc(); 返回关联数组

$data['user_list'] = $users;
$this->load->view('index/users',$data);
}

public function add{
$this->load->database();

$sql = "insert into blog_user (name,password) values ('mary',md5('mary'))";

$bool = $this->db->query($sql);

if($bool){
//mysql_affected_rows
echo $this->db->affected_rows(); //受影响行数
echo $this->db->insert_id(); //自增id
}


}

$autoload['libraries'] = array('database');

class MY_Controller extends CI_Controller{
　　//构造方法会自动调用
　　　public function __construct(){
　　　　parent::__construct(); //调用父类的构造方法

　　　　//登陆验证...

　　　　//权限验证...
　　}

public function funcname(){
}

//装载类文件
$this->load->library('pagination');
//每页显示10 条数据
$page_size = 10;

$config['base_url'] = site_url('user/test');

// 一共有多少条数据
$config['total_rows'] = 100;

//每页显示多少条
$config['per_page'] = $page_size;

$config['first_link'] = '首页';
$config['next_link'] = '下一页';
$config['uri_segment'] = 3; //分页的数据查询偏移量在哪一段上

$this->pagination->initialize($config);

$offset = intval($this->uri->segment(3)); //和 $config['uri_segment'] 对应

$sql = "select * from user limit {$offset},{$page_size}";

echo $sql;

//创建链接
$data['links'] = $this->pagination->create_links();

$this->load->view('user/test',$data);

//控制器

public function upload(){
　　//上传目录需要手工创建
　　$config['upload_path'] = './uploads/';
　　$config['allowed_types'] = 'gif|png|jpg|jpeg';
　　//生成新的文件名
　　$config['file_name'] = uniqid();
　　//装载文件上传类
　　$this->load->library('upload',$config);
　　$this->upload->do_upload('pic');

　　var_dump($this->upload->data());
　　//获取上传之后的数据
　　$data = $this->upload->data();

　　$filename = $data['file_name'];
　　echo $filename;
}

public function login(){
　　//生成一个随机字符串作为一个加密用的 key
　　//保存到 config.php 中的 $config['encryption_key'] = '';
　　// echo md5(uniqid());exit;
　　$this->load->library('session');

　　$user = array('id'=>3,'name'=>'jack');

　　// session_start();
　　// $_SESSION['user'] = $user;
　　$this->session->set_userdata('user',$user);
　　//不要在这里获取放入的数据，只有页面重新加载或跳转到别的url中，才能获取

　　//一次性的数据，只能读取一次
　　$this->session->set_flashdata('index','abcdefghij');
}

public function show_session(){
　　$this->load->library('session');
　　//取 CI session 中的数据
　　$user = $this->session->userdata('user');
　　var_dump($user);


　　//下次刷新，就没有了
　　$test = $this->session->flashdata('index');
　　echo $test;

}

public function valid(){
　　$this->load->helper('captcha');
　　$vals = array(
　　　　'word' => rand(1000,9999),
　　　　'img_path' => './captcha/',
　　　　'img_url' => base_url().'/captcha/',
　　　　'img_width' => 100,
　　　　'img_height' => 30,
　　　　'expiration' => 60*10 //过期时间,时间一到，会自动删除图片
　　);

　　$cap = create_captcha($vals);
　　echo $cap['image'];

　　echo $cap['word'];

　　session_start();
　　//验证时，对比 $_SESSION['cap']
　　$_SESSION['cap'] = $cap['word'];
}

// 控制器文件

public function insert(){
　　// var_dump($this->input->post('name'));

　　$this->load->library('form_validation');

　　$this->form_validation->set_rules('name','用户名','required');
　　$this->form_validation->set_rules('email','邮箱','valid_email');

　　$bool = $this->form_validation->run();

　　if ($bool) {
　　　　//调用模型保存到数据库

　　}else{
　　　　//显示错误信息
　　　　$this->load->view('user/add');
　　}

}

// 视图文件

<?php echo validation_errors(); ?>
<form action="<?php echo site_url('user/insert');?>" method="post">
name:<input type="text" name="name" value="<?php echo set_value('name');?>"><?php echo form_error('name','<span>','</span>'); ?><br>
pass: <input type="password" name="pass"><br>
age: <input type="number" name="age"><br>
sex: <input type="text" name="sex"><br>
email: <input type="text" name="email" value="<?php echo set_value('email');?>"><?php echo form_error('email','<span>','</span>'); ?><br>

<input type="submit" value="提交">    
</form>