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Homephp教程php手册教你用PHP写MySQL数据库用户认证系统

教你用PHP写MySQL数据库用户认证系统

Jun 13, 2016 am 10:07 AM
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这两天受朋友的托付,要我帮他写一个使用MySQL数据库的用户认证系统。我当然不好推脱的,只得耗费了一晚上的休息时间,写了个很简单的PHP程序。

用户认证的原理很简单:首先需要用户在页面上填入用户名和密码,当然没注册的用户需要先注册。然后调用数据库搜索是否有相应的用户。假如有就确认,没有则提醒用户先注册。使用PHP来完成这一切很简单,但需要注重的是假如想在以后的页面中都能确认用户身份,使用PHP3我只能想出使用cookie的方法。要想使用session,就只能等待PHP4正式版的发布了!

第一步是做一个登录的页面,这儿就不多讲了。我只做了个极简单的,大家可以做得漂亮点。

第二步开始登录后的确认程序的设计。


??login.php:?
mysql_connect("localhost","user","password")
/*连接数据库,用户名和密码自行修改*/
or die("无法连接数据库,请重试");

mysql_select_db("userinfo")
or die("无法选择数据库,请重试");
$today=date("Y-m-d H:i:s");

$query="
select id
from usertbl
where name=$name and password=$password
/*从数据库中搜索和登录用户相应的资料*/
";
$result=mysql_query($query);
$numrows=mysql_num_rows($result);


if($numrows==0){
/*验证是否能找出相同资料的用户,不能则未注册*/
echo 非法用户
;
echo 请注册先
;
echo 重试
;
}

else{
$row=mysql_fetch_array($result);
$id=$row[0];
$query="
update usertbl
set lastlogin=$today
where id=$id";
$result=mysql_query($query);
SetCookie("usercookie", "欢迎你,$name");
/*这里使用了cookie,以方便之后的页面认证。
但我未开发完这一块。希望有爱好的朋友指正*/
echo 登录成功
;
echo 请进!
;
}

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