检验登陆类

代码

<?php

class checklogin
{
   var $name;
   var $pwd;

   function __construct($username,$password)
   {
     $this->name=$username;
     $this->pwd=$password;
   }

   function checkinput()
   {
     global $db;
     $sql="select * from tb_manager where name=&#39;$this->name&#39; and pwd=&#39;$this->pwd&#39;";
     $res=$db->query($sql);
     $info=$db->fetch_array($res); 
     if($info[&#39;name&#39;]==$this->name and $info[&#39;pwd&#39;]==$this->pwd)
     {
         $_SESSION[admin_name]=$info[name];
		 $_SESSION[pwd]=$info[pwd];
         echo "<script>alert(&#39;登录成功！);window.location.href=&#39;index.php&#39;;</script>";
     }
     else
     {
		 echo "<script language=&#39;javascript&#39;>alert(&#39;登录失败！&#39;);history.back();</script>";
         exit;
     }
   }


}


?>