使用PHP实现用户登录和注册的功能

客官°小女子只卖身不卖艺 2021-09-16 14:48 467阅读 0赞

使用**PHP**实现[用户登录][Link 1]和注册的功能，相信很多同学都可以写的出来用**PHP**实现登录注册的功能了，给一些刚入门的**PHP**程序员，给你们指路了。

**登陆界面 login.php**

**登录处理界面 logincheck.php**

<?php 
    
        if(isset($_POST["submit"]) && $_POST["submit"] == "登陆") 
    
        { 
    
            $user = $_POST["username"]; 
    
            $psw = $_POST["password"]; 
    
            if($user == "" || $psw == "") 
    
            { 
    
                echo "<script>alert('请输入用户名或密码！'); history.go(-1);</script>"; 
    
            } 
    
            else 
    
            { 
    
                mysql_connect("localhost","root","sixx"); 
    
                mysql_select_db("vt"); 
    
                mysql_query("set names 'gbk'"); 
    
                $sql = "select username,password from user where username = '$_POST[username]' and password = '$_POST[password]'"; 
    
                $result = mysql_query($sql); 
    
                $num = mysql_num_rows($result); 
    
                if($num) 
    
                { 
    
                    $row = mysql_fetch_array($result);  //将数据以索引方式储存在数组中 
    
                    echo $row[0]; 
    
                } 
    
                else 
    
                { 
    
                    echo "<script>alert('用户名或密码不正确！');history.go(-1);</script>"; 
    
                } 
    
            } 
    
        } 
    
        else 
    
        { 
    
            echo "<script>alert('提交未成功！'); history.go(-1);</script>"; 
    
        } 
    
       
    
    ?>

**注册界面 register.php**

**注册处理界面 regcheck.php**

<?php 
    
        if(isset($_POST["Submit"]) && $_POST["Submit"] == "注册") 
    
        { 
    
            $user = $_POST["username"]; 
    
            $psw = $_POST["password"]; 
    
            $psw_confirm = $_POST["confirm"]; 
    
            if($user == "" || $psw == "" || $psw_confirm == "") 
    
            { 
    
                echo "<script>alert('请确认信息完整性！'); history.go(-1);</script>"; 
    
            } 
    
            else 
    
            { 
    
                if($psw == $psw_confirm) 
    
                { 
    
                    mysql_connect("localhost","root","sixx");   //连接数据库 
    
                    mysql_select_db("vt");  //选择数据库 
    
                    mysql_query("set names 'gdk'"); //设定字符集 
    
                    $sql = "select username from user where username = '$_POST[username]'"; //SQL语句 
    
                    $result = mysql_query($sql);    //执行SQL语句 
    
                    $num = mysql_num_rows($result); //统计执行结果影响的行数 
    
                    if($num)    //如果已经存在该用户 
    
                    { 
    
                        echo "<script>alert('用户名已存在'); history.go(-1);</script>"; 
    
                    } 
    
                    else    //不存在当前注册用户名称 
    
                    { 
    
                        $sql_insert = "insert into user (username,password,phone,address) values('$_POST[username]','$_POST[password]','','')"; 
    
                        $res_insert = mysql_query($sql_insert); 
    
                        //$num_insert = mysql_num_rows($res_insert); 
    
                        if($res_insert) 
    
                        { 
    
                            echo "<script>alert('注册成功！'); history.go(-1);</script>"; 
    
                        } 
    
                        else 
    
                        { 
    
                            echo "<script>alert('系统繁忙，请稍候！'); history.go(-1);</script>"; 
    
                        } 
    
                    } 
    
                } 
    
                else 
    
                { 
    
                    echo "<script>alert('密码不一致！'); history.go(-1);</script>"; 
    
                } 
    
            } 
    
        } 
    
        else 
    
        { 
    
            echo "<script>alert('提交未成功！'); history.go(-1);</script>"; 
    
        } 
    
    ?>

[Link 1]: http://www.php.cn/code/6829.html