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使用用户名,密码登录,正确可以登入,错误返回登录界面
1.建立登录界面
<body> <h1>登录</h1> <form action="chuli.php" method="post"> <div>用户名:<input type="text" name="uid" /></div> <div>密码:<input type="text" name="pwd" /></div> <div><input type="submit" value="登录" /></div> </form> </body>
2.chuli.php页面:
<?php session_start(); $uid = $_POST["uid"]; $pwd = $_POST["pwd"]; include("../DBDA.class.php");
$db = new DBDA();
$sql = "select count(*) from users where uid =‘{$uid}‘ and pwd = ‘{$pwd}‘";
$r = $db->StrQuery($sql);
if($r==1)
{
$uid = $_SESSION["uid"];
header("location:main.php");
}
else
{
header("location:log.php");
}
3.main.php页面:
<body> session_start(); //判断用户名是否为空,防止漏洞 if(empty($_SESSION["uid"])) { header("location:log.php"); } echo $_SESSION["uid"]; </body>
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原文地址:http://www.cnblogs.com/dianfu123/p/5528159.html