mysql php最簡單的登陸註冊

目錄結構：

使用者登陸<

/title>

form,h2

<

/style>

<

/head>

/h2>

login.php:

<?php 

header
("content-type: text/html; charset=utf-8");
$conn
=mysql_connect
("localhost:3306"
,"使用者名稱"
,"密碼");
if($conn);
$select
=mysql_select_db
("資料庫名"
,$conn);
if($select);
$abc
=mysql_query
("set names utf8");
if($abc);
$username
=$_post
['username'];
if($username
)else
echo
'username失敗'.'
';$password
=$_post
['password'];
if($username
)else
echo
'password失敗'.'
';$sql
="select username,password from tb_atest where username = '$username
' and password = '$password'";
$result
=mysql_query
($sql
,$conn);
$row
=mysql_fetch_object
($result);
dowhile
($row
=mysql_fetch_object
($result))
;//這裡必須寫mysql_fetch_object
mysql_free_result
($result);
mysql_close
($conn);
echo
'登陸完成'
;

<

!doctype html>
"en"
>
"utf-8"
>
"viewport"
content=
"width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"
>
"x-ua-compatible" content=
"ie=edge"
>
使用者註冊<
/title>
form,h2
<
/style>
<
/head>
/h2>

<?php 

header
("content-type: text/html; charset=utf-8");
$conn
=mysql_connect
("localhost:3306"
,"使用者名稱"
,"密碼");
mysql_select_db
("資料庫名"
,$conn);
mysql_query
("set names utf8");
$username
=$_post
['username'];
$password
=$_post
['password'];
$confirmpw
=$_post
['confirmpw'];
if($password
!=$confirmpw);
$sql
="insert into tb_atest values(null,$username
,$password)";
mysql_query
($sql
,$conn);
$result
=mysql_query
("select username from tb_atest where username = '$username'",
$conn);
if($result
)

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