代码如下

$cookie_file = tempnam('./temp','cookie'); $login_url = 'http://211.64.47.129/default_ysdx.aspx'; $post_fields = '__VIEWSTATE=dDw1MjQ2ODMxNzY7Oz7xlHJHd0KfeVRA2p7BXNto118wbQ==&TextBox1=学号&TextBox2=密码'; $ch = curl_init($login_url); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields); curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file); curl_exec($ch); curl_close($ch); $url='http://211.64.47.129/xs_main.aspx?xh=学号'; $ch = curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0); curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); $contents = curl_exec($ch); preg_match("/
 (.*)<\/li>/",$contents,$arr); echo $arr[1]; curl_close($ch);

但是最后却回到了登录的界面，小白求大神解答