PHP：必须登录两次，直到设置会话变量 [英] PHP : Must login twice until session variables are set
问题描述
当我从www.example.com/login.php（使用www）登录时，它从第一次尝试正确登录。 p>
因此，我添加了一个代码，以确保我始终在URL中包含www：
if（$ _SERVER ['HTTP_HOST'] ==example.com）
{
$ url =http：// www。 。 $ _SERVER ['HTTP_HOST']。 $ _SERVER [ REQUEST_URI];
header（Location：$ url）;
}
现在一切正常。希望它可以帮助别人。
所以，我建立了3个网站，并且都有同样的问题，知道为什么，我必须登录两次，直到我有条件登录..（直到会话变量设置）。帮助真的很感激，一直试图解决这个问题，并寻找解决方案，因为很长一段时间...
$ p $ session_start（）;
if（（isset（$ _ SESSION ['UserName']））&（isset（$ _ SESSION ['LastActivity']）））
{
header（'Location：http ：//www.example.com/Account.php'）;
$ b $ if（isset（$ _ POST ['username']））
{
mysql_connect（localhost，DBuser，pass）或
die（无法连接到mysql）;
mysql_select_db（DBNAME）或die（no database）;
$ inputUserName = $ _POST ['username'];
$ inputPass = $ _POST ['password'];
$ datausername = mysql_real_escape_string（$ inputUserName）;
$ password = md5（$ inputPass）;
$ sqlCommand =SELECT * FROM Members
WHERE UserName ='$ datausername'AND
Password ='$ password';
$ result = mysql_query（$ sqlCommand）;
$ b $ if（mysql_num_rows（$ result）> 0）
{
$ _SESSION ['UserName'] = $ datausername;
$ _SESSION ['LastActivity'] = time（）;
sleep（2）;
$ LoginDate = date（'Y-m-d H：i：s'）;
mysql_connect（localhost，DBUPDATEusername，DBuserPass）或
die（无法连接到mysql）;
mysql_select_db（databaseName）或死（no database）;
mysql_query（更新成员SET LastLogin ='$ LoginDate'WHERE
UserName ='$ datausername'）;
mysql_close（）;
echo'< meta http-equiv =Refreshcontent =0; url = http：//www.example.com/Account.php？p = Login_Success/>';
}
else {
mysql_close（）;
echo'< div id =error_msg>错误：输入的信息不正确。 < / div>';}
}
}
？>请检查并再试一次。
登录表单（with action =），以及方法后）。
$ b 注意：我使用html刷新标记，因为我不能使用标题重定向..（我得到的错误是标题已经发送）。
以及example.com/Account.php我会在代码顶部检查：
session_start（）;
if（（！isset（$ _ SESSION ['UserName']））||（！isset（$ _ SESSION ['LastActivity']）））
{
header（'Location：http ？：//www.example.com/ p = Must_Login'）;
}
而且这似乎是我第一次登录并重定向到account.php面板..会话值没有设置，并将我重定向到Must_Login页面。我再次登录（我第一次使用的登录页面相同，但是第二次登录时，它确实设置了会话值，并且一切正常。）
谢谢非常感谢您的帮助！
解决方案：经过数小时的搜索，似乎出现了这个问题，当我访问我的网站没有在域名前添加www，所以实际发生的情况是，我在某处登录了mydomain.com/login.php设置会话，我的会员控制无法识别，因此它将我重定向回到www.mydomain.com/login.php，当我登录一切工作正常。
当我从www.mydomain.com/login.php登录（与所以我添加了一个代码，以确保我始终在URL中包含www：
$ b $（$） b
if（$ _SERVER ['HTTP_HOST'] ==mydomain.com）
{
$ url =http：/ / www。。$ _SERVER ['HTTP_HOST']。$ _SERVER [ REQUEST_URI];
标题（ 位置：$ URL）;
}
现在一切正常。希望它能帮助别人。
SOLUTION: after many hours of searching, it seems this problem was occurring when I access my website without adding the "www." before the domain. so what actually was happening is, I was logging in with example.com/login.php sets session somewhere, that my member control doesn't recognize, so it redirects me back to www.example.com/login.php, that when I login everything works Ok.
when I login from www.example.com/login.php (with the www.) it logs in correctly from first attemp.
So I added a code to make sure I always have the www in the URL:
if ($_SERVER['HTTP_HOST'] == "example.com")
{
$url = "http://www." . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
header("Location: $url");
}
and everything works well now. Hope it helps someone.
So, I have built over 3 websites, and all have same problem, I don't know why, I have to login twice till I'm rly logged in.. (till the session variables are set). Help is really appreciated, been trying to fix this and looking for solution since a long time...
session_start();
if ((isset($_SESSION['UserName']))&&(isset($_SESSION['LastActivity'])))
{
header ('Location: http://www.example.com/Account.php');
}
if (isset($_POST['username']))
{
mysql_connect("localhost","DBuser","pass") or
die ("could not connect to mysql");
mysql_select_db("DBNAME") or die ("no database");
$inputUserName = $_POST['username'];
$inputPass = $_POST['password'];
$datausername = mysql_real_escape_string($inputUserName);
$password=md5($inputPass);
$sqlCommand = "SELECT * FROM Members
WHERE UserName='$datausername' AND
Password='$password'";
$result = mysql_query($sqlCommand);
if (mysql_num_rows($result) > 0)
{
$_SESSION['UserName'] = $datausername;
$_SESSION['LastActivity']= time();
sleep(2);
$LoginDate = date('Y-m-d H:i:s');
mysql_connect("localhost","DBUPDATEusername","DBuserPass") or
die ("could not connect to mysql");
mysql_select_db("databaseName") or die ("no database");
mysql_query("Update Members SET LastLogin='$LoginDate' WHERE
UserName='$datausername'");
mysql_close();
echo '<meta http-equiv="Refresh" content="0;url=http://www.example.com/Account.php?p=Login_Success"/>';
}
else {
mysql_close();
echo '<div id="error_msg">Error: Information entered are not correct. Please check and try again.</div>';}
}
}
?>
<form...
login form (with action=""), and method post).
Note: I use the html refresh tag, because I can't use the header redirect.. (I get error that header is already sent).
and in the example.com/Account.php I do this check at the top of the code:
session_start();
if ((!isset($_SESSION['UserName']))||(!isset($_SESSION['LastActivity'])))
{
header('Location: http://www.example.com/?p=Must_Login');
}
And and it seems that first time I login and am redirected to account.php panel.. the session values are not set, and redirects me back to Must_Login page. I login again (same login page I use at first time. But the second time when I login, it does set the session values, and everything is OK.
Thank you very much for your help in advance!
SOLUTION: after many hours of searching, it seems this problem was occurring when I access my website without adding the "www." before the domain. so what actually was happening is, I was logging in with mydomain.com/login.php sets session somewhere, that my member control doesn't recognize, so it redirects me back to www.mydomain.com/login.php, that when I login everything works Ok.
when I login from www.mydomain.com/login.php (with the www.) it logs in correctly from first attemp.
So I added a code to make sure I always have the www in the URL:
if ($_SERVER['HTTP_HOST'] == "mydomain.com")
{
$url = "http://www." . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
header("Location: $url");
}
and everything works well now. Hope it helps someone.
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