PHP login and logout example code_PHP tutorial

Here our pm_user data table has not created a table. You can create it yourself. The following only introduces the program code for logging in using php and then logging out. Friends in need can refer to it.

login.htm

The code is as follows

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代码如下	复制代码

代码如下

复制代码

function showPage() //判断是否登录 未登录直接跳转至登录页面 {  if(!isset($_SESSION["user"]) && !isset($_SESSION["pwd"]))  {   if(isset($_COOKIE["user"]) && isset($_COOKIE["pwd"]))   {    $sql = "select * from pm_user where u_user='$_COOKIE[user]'";    $query = mysql_query($sql);    $isUser = is_array($row = mysql_fetch_array($query)); //判断用户名    $isPwd = $isUser ? $row["u_pwd"] == $_COOKIE["pwd"] : false; //判断密码    if($isPwd)    {     $_SESSION["user"]  = $_COOKIE["user"];     $_SESSION["pwd"]   = $_COOKIE["pwd"];     $_SESSION["id"]    = $_COOKIE["id"];     $_SESSION["name"]  = $_COOKIE["name"];    }   }  }    if(!isset($_SESSION["user"]) && !isset($_SESSION["pwd"]))  {   echo '<script>alert("你还没登录！正在返回登录页面...");location.href="index.php";</script>';   exit();  } }

login.php

The code is as follows

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function showPage() //Determine whether you are logged in or not. Jump directly to the login page if you are not logged in { if(!isset($_SESSION["user"]) && !isset($_SESSION["pwd"])) { if(isset($_COOKIE["user"]) && isset($_COOKIE["pwd"])) { $sql = "select * from pm_user where u_user='$_COOKIE[user]'"; $query = mysql_query($sql); $isUser = is_array($row = mysql_fetch_array($query)); //Determine user name $isPwd = $isUser ? $row["u_pwd"] == $_COOKIE["pwd"] : false; //Judge password if($isPwd) { $_SESSION["user"] = $_COOKIE["user"]; $_SESSION["pwd"] = $_COOKIE["pwd"]; $_SESSION["id"] = $_COOKIE["id"]; $_SESSION["name"] = $_COOKIE["name"]; } } } if(!isset($_SESSION["user"]) && !isset($_SESSION["pwd"])) { echo '<script>alert("You are not logged in yet! Returning to the login page...");location.href="index.php";</script>'; exit(); } }

退出登录

out.php

 代码如下

代码如下	复制代码
function loginOut() //登出函数 {  if(isset($_GET["login"]) == 'out')  {   $_SESSION["user"]  = '';   $_SESSION["pwd"]   = '';   $_SESSION["id"]    = '';   $_SESSION["name"]  = '';   session_destroy();   echo '<script>alert("退出成功！");location.href="index.php"; </script>';  } }

复制代码

function loginOut() //登出函数
{
 if(isset($_GET["login"]) == 'out')
 {
  $_SESSION["user"]  = '';
  $_SESSION["pwd"]   = '';
  $_SESSION["id"]    = '';
  $_SESSION["name"]  = '';
  session_destroy();
  echo '<script>alert("退出成功！");location.href="index.php"; </script>';
 }
}

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TechArticle

这里我们pm_user是数据表没有创建表，大家可以自己行创建了，下面只介绍利用php登录然后再退出登录的程序代码，有需要的朋友可进行参考...