PHP 模拟登陆功能实例详解

<form method="post" class="am-form" action="judge.php">
   <label for="sid">学号:</label>
   <input type="text" name="number" id="sid" value="">
   <br>
   <label for="password">密码:</label>
   <input type="password" name="passwd" id="password" value="">
   <br>
   <div class="am-cf">
    <input type="submit" name="" value="登 录" class="am-btn am-btn-primary am-btn-sm am-fl">
    <input type="submit" name="" value="忘记密码 ^_^? " class="am-btn am-btn-default am-btn-sm am-fr">
   </div>
  </form>

session_start();
require_once 'curl.php';
$url = "http://opac.lib.ustc.edu./reader/redr_info.php";
$number = $_POST['number'];
$passwd = $_POST['passwd'];
$res = run_curl($url,$number,$passwd);
$pattern = '/<TD><span class=\"bluetext\">姓名<\/span>(.)<\/TD>/';
preg_match($pattern, $res,$arr1);
if(is_array($arr1)){
 $_SESSION['number'] = $number;
 $_SESSION['passwd'] = $passwd;
 $_SESSION['name'] = $arr1[1];
 echo "<script>window.location.href='index.php';</script>";
}else{
 echo "<script>history.go(-1);</script>";
}

<?php
function run_curl($content_url,$number='',$passwd=''){
  $cookie_file = tempnam('./temp','cookie');
  $url = "http://opac.lib.ustc.edu./reader/redr_verify.php";
  $ch = curl_init($url);
  curl_set($ch, CURLOPT_HEADER, 0);
  curl_set($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_set($ch,CURLOPT_FOLLOWLOCATION,1);
  $post_fileds = "number=$number&passwd=$passwd&select=bar_no";
  curl_set($ch,CURLOPT_POST,1);
  curl_set($ch,CURLOPT_POSTFIELDS,$post_fileds);
  curl_set($ch,CURLOPT_COOKIEFILE,$cookie_file);
  curl_set($ch,CURLOPT_COOKIEJAR,$cookie_file);
  $content = curl_exec($ch);
  curl_close($ch);
  $ch = curl_init($content_url);
  curl_set($ch, CURLOPT_HEADER, 0);
  curl_set($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_set($ch,CURLOPT_FOLLOWLOCATION,1);
  curl_set($ch,CURLOPT_COOKIEFILE,$cookie_file);
  curl_set($ch,CURLOPT_COOKIEJAR,$cookie_file);
  $res = curl_exec($ch);
  curl_close($ch);
  return $res;
}

<?php
  session_start();
  $number = $_SESSION['number'];
  $passwd = $_SESSION['passwd'];
  $username = $_SESSION['name'];
  if($number==''||$passwd==''||$username==''){
    echo "<script>window.location.href='login.php';</script>";
    exit();
  }
  require_once 'curl.php';
  header('Content-type:text/html;charset=utf-8');
  $url = "http://opac.lib.ustc.edu./reader/book_lst.php";
  $res = run_curl($url,$number,$passwd); //通过curl抓取数据
  $pattern = '/<td class="whitetext" width="35%"><a class="blue" href="(.)" rel="external nofollow" >(.)<\/a>/';//正则匹配获得图书信息
  preg_match_all($pattern, $res,$book_arr);
  $booklist = array();
  $booklist = $book_arr[2];  //借阅图书列表
  //var_dump($booklist);
  $pattern = '/<font color=(red|)>(.)<\/font>/';//正则匹配获得还书信息
  preg_match_all($pattern, $res,$date_arr);
  $datelist = array();
  $datelist = $date_arr[2];  //应归还日期列表
  $taglist = array();
  $taglist = $date_arr[1];  //标记是否超期
  //var_dump($date_arr);
?>

<?php
session_start();
$_SESSION = array();
session_destroy();
?>
<script>window.location.href='login.php'</script>