background image

</head> 
<body> 
<?php 
    session_start(); 
    require("config.auth.php"); 
    if ($_POST[submit]) { 
               $sql="select  *  from  userinfo  where  username  =  '$_POST[username]'  and  password  = 
'$_POST[password]'"; 
        $result=mysql_query($sql); 
        $numrows=mysql_num_rows($result); 
        if ($numrows == 1) { 
            $row=mysql_fetch_assoc($result); 
            $_SESSION[username]=$row[username]; 
            //echo $_SESSION[username]; 
            echo "<script>alert('登陆成功！');window.location.href='left.php';</script>"; 
        }else { 
            echo "<script>alert('登陆失败！');window.location.href=\'#\'" /script>"; 
        } 
    }else { 
        echo "<script>alert('请通过正确途径登陆！');window.location.href=\'#\'" /script>"; 
    } 
    mysql_free_result($result); 
    mysql_close($conn); 
?> 
</body> 
</html>
4，logout.php
代码示例

:

<!DOCTYPE 

html 

PUBLIC 

"-//W3C//DTD 

XHTML 

1.0 

Transitional//EN" 

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>登陆系统_www.jbxue.com</title> 
</head> 
<body> 
<?php 
 session_start(); 
 unset($_SESSION[username]); 
 session_destroy(); 
 echo "<script>alert('注销成功！');window.location.href=\'#\'" /script>"; 
?> 
</body> 
</html>