<?phperror_reporting(0);$mysql_servername = ""; //主机地址$mysql_username = ""; //数据库用户名$mysql_password =""; //数据库密码$mysql_database =""; //数据库mysql_connect($mysql_servername , $mysql_username , $mysql_password);mysql_select_db($mysql_database); $name=$_POST[‘name‘];$password=$_POST[‘password‘];$VerificationCode=$_POST[‘check‘];//MD5加密$md5password=md5($password);//验证验证码if($VerificationCode!=$_SESSION[‘VerifyCode‘]){echo "<script language=javascript>alert(‘验证码错误！‘);history.back();</script>";} //验证用户名和密码if ($name && $password){$sql = "SELECT * FROM admin WHERE admin_name = ‘$name‘ and admin_pw=‘$md5password‘";$res = mysql_query($sql);$rows=mysql_num_rows($res);if($rows){//定义sessionsession_start();$_SESSION[‘admin_name‘]=$name;header("refresh:0;url=../index.php");//跳转页面，注意路径exit;}echo "<script language=javascript>alert(‘用户名密码错误‘);history.back();</script>";}else {echo "<script language=javascript>alert(‘用户名密码不能为空‘);history.back();</script>";}?>