PHP 使用cookie实现记住登录状态

来源：互联网发布：安卓程序员好找工作吗编辑：程序博客网时间：2024/04/29 06:58

php使用cookie实现记住登录状态，本文用最原始的方法讲解如何实现记住登录状态，给出3个步骤和具体实现代码，需要的朋友可以参考下。

要实现记住密码自动登录的功能，我们大多数据都是利用了客户端的cookies来实现。

php制作记住密码自动登录的解决思路，其实也就是对session，cookies的操作

一、检查用户是否登录

<?php// 检查用户是否登录function checklogin() {    if (empty ( $_SESSION ['user_info'] ))         // 检查一下session是不是为空    {         if (empty ( $_COOKIE ['username'] ) || empty ( $_COOKIE ['password'] ))         {             header ( "location:login.php?req_url=" . $_SERVER ['REQUEST_URI'] ); // 转到登录页面，记录请求的url，登录后跳转过去，用户体验好。        }         else        {             $user = getUserInfo ( $_COOKIE ['username'], $_COOKIE ['password'] ); // 去取用户的个人资料            if (empty ( $user ))             {                 header ( "location:login.php?req_url=" . $_SERVER ['REQUEST_URI'] );            }             else {                $_SESSION ['user_info'] = $user; // 用户名和密码对了，把用户的个人资料放到session里面            }        }    }}?>

二，用户提交登录信息

<?php$username = trim ( $_POST ['username'] );$password = md5 ( trim ( $_POST ['password'] ) );$remember = $_POST ['remember'];$validatecode = $_POST ['validateCode'];$ref_url = $_GET ['req_url']; $err_msg = '';if ($validatecode != $_SESSION ['checksum']) {    $err_msg = "验证码不正确";} elseif ($username == '' || $password == '') {    $err_msg = "用户名和密码都不能为空";} else {    $row = getUserInfo ( $username, $password );         if (empty ( $row )) {        $err_msg = "用户名和密码都不正确";    } else {        $_SESSION ['user_info'] = $row;        if (! empty ( $remember )) { // 如果记住登陆，则记录登录状态，把用户名和加密的密码放到cookie里面            setcookie ( "username", $username, time () + 3600 * 24 * 365 );            setcookie ( "password", $password, time () + 3600 * 24 * 365 );        }        if (strpos ( $ref_url, "login.php" ) === false) {            header ( "location:" . $ref_url );        } else {            header ( "location:main_user.php" );        }    }}?>

三，当用户点退出时，清出记录登录状态

<?php// 退出登录function logout() {    unset ( $_SESSION ['user_info'] );    if (! empty ( $_COOKIE ['username'] ) || ! empty ( $_COOKIE ['password'] ))     {        setcookie ( "username", null, time () - 3600 * 24 * 365 );        setcookie ( "password", null, time () - 3600 * 24 * 365 );    }}?>

四、简洁版实例

<?    // 读取COOKIE的用户名和密码的值即可    if ($_COOKIE ['uname'] != '') {        $CKUNAME = $_COOKIE ['uname'];    }    if ($_COOKIE ['pwd'] != '') {        $CKPWD = $_COOKIE ['pwd'];    }    echo $CKUNAME;    echo '<br>';    echo $CKPWD;?> <form id="form1" name="form1" method="post" action="">    <input type="text" name="uname" id="uname" value="<?=$CKUNAME;?>" />     <input type="password" name="pwd" id="pwd" value="<?=$CKPWD;?>" />     <input name="remember" type="checkbox" value="1" <? if($CKUNAME!=''){?> checked="checked" <? } ?> /> 记住我!     <input type="submit" name="button" id="button" value="登录" /></form> <?    // 登录，将用户名和密码存入到COOKIE    if ($_POST ['button'] != '')     {        $uname = $_POST ['uname'];        $pwd = $_POST ['pwd'];                 // 如果输入的加密密码和COOKIE中不一样，那么就加密        if ($pwd != $CKPWD) {            $pwd = md5 ( $pwd );        }        $remember = $_POST ['remember'];        if ($remember == 1) {            setcookie ( "uname", $uname, time () + 3600 * 24 * 30 );            setcookie ( "pwd", $pwd, time () + 3600 * 24 * 30 );        }    }?>

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