php之session代码

来源：互联网发布：淘宝商品批量上传编辑：程序博客网时间：2024/06/15 03:03

代码只放通过SID判断使用cookie还是session

login.php

<?phpsession_start();echo session_id()."<br>";  //跳转页面不能不是header    if(isset($_POST["sub"])){    include "conn.inc.php";    $sql="select id from users where name='{$_POST["name"]}' and password='".md5($_POST["password"])."'";    $result=$mysqli->query($sql);    //保存数据    if($result->num_rows > 0){    $row=$result->fetch_assoc();        $_SESSION["username"]=$_POST["name"];    $_SESSION["uid"]=$_POST["uid"];    $_SESSION["isLogin5"]=1;    //跳转界面    echo '<script>';    echo "location='index.php?".SID."'";   //SID 常量如果开启cookie则使用cookie，如果没开启就用session    echo '</script>';    }    echo "用户名密码有误";    }?><html><head><title>用户登录</title></head><body><form action="login.php?<?php echo SID; ?>" method="post"><table align="center" border="1" width="300"><caption><h1>用户登录</h1></caption><tr><th>用户名</th><td><input type="text" name="name"></td></tr><tr><th>密码</th><td><input type="password" name="password"></td></tr><tr><td colspan="2" align="center"><input type="submit" name="sub" value="登录"></td></tr></table></body></html>

conn.inc.php

<?php    $mysqli=new mysqli("localhost","root","heyifeng19930924","sqldb");

comm.php

<?phpsession_start();    //判断：如果没登录自动跳转到登录页面    if(!$_SESSION["isLogin5"]){        header("Location:login.php");    }

index.php

<?php    include "comm.php";  //判断是否登录成功    include "conn.inc.php";    echo "用户<b>".$_SESSION["username"]."</b>你好!这是网站首页";    echo session_id()."<br>";    echo "你的权限如下：<br>";    $sql="select allow_1,allow_2,allow_3,allow_4 from users where id='{$_SESSION["uid"]}'";    $result=$mysqli->query($sql);    $user=$result->fetch_assoc();    if($user["allow_1"]){        echo "111111111111<br>";    }    if($user["allow_2"]){        echo "222222222222<br>";    }    if($user["allow_3"]){        echo "333333333333<br>";    }    if($user["allow_4"]){        echo "444444444444<br>";    }    ?>    <a href="test.php?<?php SID ?>">第二页</a><br>    <a href="test2.php?<?php SID ?>">第三页</a><br>    <a href="logout.php?<?php SID ?>">退出</a><br>

test.php和test2.php编写上和index.php如出一辙

logout.php

<?php    include "comm.php";  //判断是否登录成功        $username=$_SESSION["username"];  //取出用户名    $sid=session_id();    //开启session    session_start();    //情况session值    $_SESSION=array();    //删除客户端的在cookie中的sessionid    if(isset($_COOKIE[session_name()])){        setCookie(session_name(),'',time()-3600,'/'); //一定要写上第四个参数(路径)    }    //彻底销毁session    session_destroy();    echo $username."再见!";    echo $sid;?><br><!--<a href="login.php?PHPSESSID=<?php echo session_id() ?>">重新登录</a>--><a href="login.php">重新登录</a>

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