Use PHP to implement user login and registration functions

Use PHP to realize the user login and registration functions. I believe many students can write and use PHP to realize the login and registration functions. Here are some For those new PHP programmers, I will show you the way.

Login interface login.php

  
    用户名：  
    
  
    密码：  
    
  
      
          
    注册  

Login processing interface 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 "";  
    }  
  
?>

Registration interface register. php

  
    用户名：  
    
  
    密　码:  
    
  
    确认密码：  
    
  
      

Registration processing interface 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 "";  
    }  
?>

The above is the function of using PHP to register and log in, for PHP programmers who are just getting started. More good articles and video tutorials about PHP are available at PHP中文网! I wish you will become a great person soon!

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