php的登陆系统

来源：互联网发布：周金涛2019买点知乎编辑：程序博客网时间：2024/06/06 06:31

参考文章http://blog.csdn.net/qazcxh/article/details/45726911

php的学习一直处于简单的一两个文件之内，今天看到了一个比较多文件的学习文章，于是就照着它动手敲了一遍了，感觉还可以。

第一部分当然就是登陆的界面了：

index.html

<!DOCTYPE html><html><head>    <meta charset="utf-8">    <title>登陆注册修改密码系统主页</title>    <style type="text/css">        form{            text-align:center;        }    </style></head><body><!-- 表单 -->    <form action="enter.php" method="post" onsubmit="return enter()">        用户名<input type="text" name="username" id="username"><br/>密码<input type="password" name="password" id="password"><br/><input type="submit" value="登陆"><input type="button" value="注册" onclick="register();">    </form>    <script type="text/javascript">    //检测数据是否正确，从而判断是否提交表单数据    function enter(){        var username=document.getElementById("username").value;        var password=document.getElementById("password").value;        var regex=/^[/s]+$/;        if(regex.test(username)||username.length==0){            alert("用户名格式不对");            return false;        }        if(regex.test(password)||password.length==0){            alert("密码格式不对");            return false;        }        return true;    }    //转到注册页面    function register(){        window.location.href="register.html";    }    </script></body></html>

enter.php:

<!DOCTYPE html><html><head>    <meta charset="utf-8">    <title>登陆系统的后台执行过程</title></head><body>    <?php        session_start();//开启session        //获取表单中input的name中的数据        $username=$_REQUEST["username"];        $password=$_REQUEST["password"];        //连接服务器        $con=mysql_connect("localhost","root","root");        if(!$con){            die('数据库连接失败'.mysql_error());        }        //选择数据库        mysql_select_db("user_info",$con);        $dbusername=null;        $dbpassword=null;        //查找当前输入的用户名        $result=mysql_query("select * from user_info where username='{$username}' and isdelete=0;");        while($row=mysql_fetch_array($result)){            $dbusername=$row["username"];            $dbpassword=$row["password"];        }        //如果不存在，返回index.html        //密码不正确，也是返回index.html        if(is_null($dbusername)){            ?>            <script type="text/javascript">            alert("用户名不存在");            window.location.href="index.html";            </script>    <?php        }        else {            if($dbpassword!=$password){     ?>     <script type="text/javascript">     alert("密码错误");     window.location.href="index.html";     </script>     <?php        }        else{            $_SESSION["username"]=$username;            //给session一个随机值，防止直接在地址栏内输入wecome的地址            $_SESSION["code"]=mt_rand(0,100000);     ?>     <script type="text/javascript">     window.location.href="wecome.php";     </script>     <?php        }    }    mysql_close($con);    ?></body></html>

wecome.php:

<!DOCTYPE html><html><head>    <meta charset="utf-8">    <title>欢迎登陆界面</title></head><body>    <?php    session_start();//打开session    //判断是否设置了session【“code”】    if(isset($_SESSION["code"])){    ?>    欢迎登陆<?php    echo "${_SESSION["username"]}";    ?><br/>    您的ip:<?php    echo "{$_SERVER['REMOTE_ADDR']}";    ?>    <br/>    您的语言:    <?php    echo "${_SERVER['HTTP_ACCEPT_LANGUAGE']}";    ?>    <br/>    浏览器版本:    <?php    echo "${_SERVER['HTTP_USER_AGENT']}";    ?>    <a href="exit.php">退出登陆</a>    <?php        }else {    ?>    <script type="text/javascript">    alert("退出登陆");    window.location.href="exit.php";    </script>    <?php        }    ?>    <br/>    <a href="alter_password.html">修改密码</a></body></html>

alter_password.html:

<!DOCTYPE html><html><head>    <meta charset="utf-8">    <title>修改密码</title>    <style type="text/css">        form{            text-align:center;        }    </style></head><body>    <?php        session_start();    ?>    <form action="alter_password.php" method="post" onsubmit="return alter()">        用户名<input type="text" name="username" id="username" /><br/>旧密码<input        type="password" name="oldpassword" id="oldpassword" />新密码<input type="password"        name="newpassword" id="newpassword" /><br/>确认新密码<input type="password" name="assertpassword" id="assertpassword"/><br/><input type="submit" value="修改密码" onclick="return alter()">    </form>    <script type="text/javascript">    document.getElementById("username").value="<?php echo "${_SESSION["username"]}";?>";    </script>    <script type="text/javascript">    //判断是否传数据过form的action    function alter(){        var username=document.getElementById("username").value;        var oldpassword=document.getElementById("oldpassword").value;        var newpassword=document.getElementById("newpassword").value;        var assertpassword=document.getElementById("assertpassword").value;        var regex=/^[/s]+$/;        if(regex.test(username)||username.length==0){            alert("用户格式不对");            return false;        }        if(regex.test(oldpassword)||oldpassword.length==0){            alert("密码格式不对");            return false;        }        if(regex.test(newpassword)||newpassword.length==0){            alert("新密码格式不对");            return false;        }        if(assertpassword!=newpassword||assertpassword==0){            alert("两次密码输入不一致");            return false;        }        return true;    }    </script></body></html>

alter_password.php:

<!DOCTYPE html><html><head>    <meta charset="utf-8">    <title>正在修改密码</title></head><body>    <?php    session_start();//打开session    //提取input标签的一系列数据    $username = $_REQUEST["username"];    $oldpassword = $_REQUEST["oldpassword"];    $newpassword = $_REQUEST["newpassword"];    //连接服务器    $con = mysql_connect("localhost","root","root");    if(!$con){        die('数据库连接失败'.mysql_error());    }    //选择数据库    mysql_select_db("user_info",$con);    $dbusername = null;    $dbpassword = null;    //查找当前名字的数据    $result = mysql_query("select * from user_info where username='{$username}' and isdelete=0;");    while($row=mysql_fetch_array($result)){        $dbusername = $row["username"];        $dbpassword = $row["password"];    }    //判断是否存在    if(is_null($dbusername)){        ?>        <script type="text/javascript">            alert("用户名不存在");            window.location.href="alter_password.html";        </script>    <?php    }    //判断旧密码和当前所用密码是否相同    if($oldpassword!=$dbpassword){    ?>    <script type="text/javascript">    alert("密码错误");    window.location.href="alter_password.html";    </script>    <?php    }    mysql_query("update user_info set password='{$newpassword}' where username='{$username}'")    or die("存入数据库失败".mysql_error());    mysql_close($con);    ?>    <script type="text/javascript">    alert("密码修改成功");    window.location.href="index.html";    </script></body></html>

<!DOCTYPE html><html><head><meta charset="utf-8"><title>注册系统</title><style type="text/css">    form{        text-align:center;    }</style></head><body>    <!-- 表单 -->    <form action="register.php" method="post" name="form_register" onsubmit="return check()">        用户名<input type="text" name="username" id="username"><br/>        密码<input type="password" name="password" id="password"><br/>        确认密码<input type="password" name="assertpassword" id="assertpassword"><br/>        <input type="submit" value="注册">    </form>    <script type="text/javascript">    //检查输入的东西是否符合，不符合不传数据过register.php    function check(){        var username=document.getElementById("username").value;        var password=document.getElementById("password").value;        var assertpassword=document.getElementById("assertpassword").value;        var regex=/^[/s]+$/;        if(regex.test(username)||username.length==0){            alert("用户名格式不对");            return false;        }        if(regex.text(password)||password.length==0){            alert("密码格式不对");            return false;        }        if(password!=assertpassword){            alert("两次密码输入不一致");            return false;        }    }    </script></body></html>

<!DOCTYPE html><html><head>    <meta charset="utf-8">    <title>注册用户</title></head><body>    <?php        session_start();//打开session        //获取传过来的数值        $username=$_REQUEST["username"];        $password=$_REQUEST["password"];        //连接服务器        $con=mysql_connect("localhost","root","root");        if(!$con){            die('数据库连接失败'.mysql_error());        }        //选择数据库        mysql_select_db("user_info",$con);        $dbusername=null;        $dbpassword=null;        //查询当前名字的数据是否存在        $result=mysql_query("select * from user_info where username='{$username}'and isdelete=0");        while($row=mysql_fetch_array($result)){            $dbusername=$row["username"];            $dbpassword=$row["password"];        }        //如果存在        if(is_null($dbusername)){        ?>        <script type="text/javascript">        alert("用户名已存在");        window.location.href="register.html";        </script>        <?php            }            mysql_query("insert into user_info (username,password)values('{$username}','{$password}')")            or die("存入数据库失败".mysql_error());            mysql_close($con);        ?>        <script type="text/javascript">        alert("注册成功");        window.location.href="index.html";        </script></body></html>

退出登陆时exit.php:

<!DOCTYPE html><html><head>    <meta charset="utf-8"></head><body>    <?php    session_start();//打开session    session_destroy();//将之前的session数据全部删除掉    ?>    <script type="text/javascript">    window.location.href="index.html";//跳转到index.html    </script></body></html>

9.mysql数据库搭建部分

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