使用PHP实现用户登录和注册的功能

使用PHP实现用户登录和注册的功能，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

 

    用户名： 

    
 

    密码： 

    
 

     

           

    注册 

登录处理界面 logincheck.php

alert('请输入用户名或密码！'); history.go(-1);"; 

        } 

        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 ""; 

            } 

        } 

    } 

    else 

    { 

        echo ""; 

    } 

   

?>

注册界面 register.php

 

    用户名： 

    
 

    密　码: 

    
 

    确认密码： 

    
 

     

注册处理界面 regcheck.php

alert('请确认信息完整性！'); history.go(-1);"; 

        } 

        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 ""; 

                } 

                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 ""; 

                    } 

                    else 

                    { 

                        echo ""; 

                    } 

                } 

            } 

            else 

            { 

                echo ""; 

            } 

        } 

    } 

    else 

    { 

        echo ""; 

    } 

?>