好的，我正在为当地部队制作童子军网站。我制作了登录系统，出于某种原因，它让我在显示登录页面之前登录了两次。请帮我弄清楚它为什么这样做。当我登录时，我必须重新加载，然后它将显示信息
<!doctype html>
<html>
<head>
<title></title>
<meta charset="utf-8" />
<link rel="stylesheet" href="style.css" />
<script src="jquery.js"></script>
<script src="script.js"></script>
</head>
<body>
<div id="wrap">
<h1 id="title">Welcome to Boy Scout Troop 416, ----------- -------</h1>
<div id="left">
<section class="part">
<h1>About Us</h1>
<p>Hello, we are Boy Scout Troop 416. Our Scout Master is Mr. Kelly Barrett. We have camp-outs about once a mouth and our meetings are every Tuesday at 7:00.</p>
</section>
<section class="part">
<h1>FAQ</h1>
<h2>When and Where are the Meetings?</h2>
<p>The meetings are every Tuesday at The Williamsburg American Legion, Post 288 on Main Street from 7:00 to 8:30.</p>
<h2>How do I sign up?</h2>
<p>To sign up you can go to "Contact Information", and contact the Scout Master and tell him you want to join then, he will help you with the rest.</p>
<h2>How much Does it cost?</h2>
<p>To sign up it is about____. Every camp-out is about $3.00 for food. The uniforms are about____.</p>
<h2>What will you learn?</h2>
<p>You will learn how to use a:</p>
<ul>
<li>Knife</li>
<li>Compass</li>
<li>Bow and Arrow</li>
<li>Axe</li>
<li>Hatchet</li>
<li>And much more!</li>
</ul>
<p>You will learn how to:</p>
<ul>
<li>Tie different kinds of knots</li>
<li>Put up a tent</li>
<li>Cook</li>
<li>Treat a hurt person</li>
<li>And a lot more!</li>
</ul>
</section>
</div>
<div id="middle">
<?php
require 'connect.inc.php';
session_start();
function getuserfield($field) {
$query = "SELECT `$field` FROM `users` WHERE `id`='".$_SESSION['user_id']."'";
if ($query_run = mysql_query($query)) {
if ($query_result = mysql_result($query_run, 0, $field)) {
return $query_result;
}
}
}
?>
<section class="part">
<h1>Announcements</h1>
<p>bla f gg keggnfm gw lorem isput g fgrh egyhe tryher t. </p>
<div class="div"></div>
<p>Need help with merit badges, try <a href="http://meritbadge.org/wiki/index.php?title=Main_Page" target="_blank">Meritbadge.org</a>.</p>
</section>
<section class="part">
<h1>Upcoming Events</h1>
<table class="table" cellpadding="10px" cellspacing="0px">
<tr>
<th>Events</th><th>Location</th> <th>Date</th><th>Time</th>
</tr>
<tr>
<td>Camp-out</td><td>A Place</td><td>11/11/11</td><td>5:30pm</td>
</tr>
<tr>
<td>Camp-out</td><td>A Place</td><td>11/11/11</td><td>5:30pm</td>
</tr>
<tr>
<td>Camp-out</td><td>A Place</td><td>11/11/11</td><td>5:30pm</td>
</tr>
</table>
</section>
<section class="part">
<h1>Contact Info.</h1>
<table>
<tr>
<td><img class="img_contact" src="pictures/person.png" /></td><td>Rick Shoe</td><td>email@example.com</td>
</tr>
<tr>
<td><img class="img_contact" src="pictures/person2.png" /></td><td>Raymond Kneipp jr.</td><td>email@example.com</td>
</tr>
<tr>
<td><img class="img_contact" src="pictures/person3.png" /></td><td>Bobby Star</td><td>email@example.com</td>
</tr>
</table>
</section>
</div>
<div id="right">
<?php
if (isset($_SESSION['user_id']) && !empty($_SESSION['user_id'])) {
echo '
<section class="part">
<h1>Account</h1>
<p>Account Balance: '.getuserfield('money').'</p>
<p>Rank: '.getuserfield('rank').'</p>
<p><a href="logout.php"><button>Logout</button></a></p>
</section>
';
echo '
<section class="part">
<form action="index.php" method="POST">
<h1>Edit Account</h1>
<p>Password: <input type="password" name="" maxlength="50" /></p>
<p>New Password: <input type="newPassword2" name="" maxlength="50" /></p>
<p>New Password: <input type="newPassword" name="" maxlength="50" /></p>
<p><a href="logout.php"><button>Logout</button></a></p>
</form>
</section>
';
} else {
?>
<section class="part">
<h1>Login</h1>
<form action="index.php" method="POST">
<table>
<tr>
<td>Username:</td><td><input type="email" name="username" value="<?php if(isset($_COOKIE['remember'])) { echo $_COOKIE['remember']; } ?>" maxlength="50"/></td>
</tr>
<tr>
<td>Password:</td><td><input type="password" name="password" maxlength="50"/></td>
</tr>
<tr>
<td>Remember Me<input type="checkbox" value="remember" /></td><td><input type="submit" value="Login" /></td>
</tr>
<tr>
<td colspan="2">
<?php
if (isset($_POST['username']) && isset($_POST['password'])) {
$username = $_POST['username'];
$password = $_POST['password'];
$password_hash = md5($password);
if (!empty($password) && !empty($username)) {
if (strlen($username) <= 50 && strlen($username) >= 5 && strlen($password) <= 50 && strlen($password) >= 5) {
$query = "SELECT `id` FROM `users` WHERE `email` = '$username' AND `password` = '$password_hash'";
$query_run = mysql_query($query);
if (mysql_num_rows($query_run) == 0) {
echo 'Username or Password is incorrect.';
} else if (mysql_num_rows($query_run) == 1) {
$user_id = mysql_result($query_run, 0, 'id');
$_SESSION['user_id'] = $user_id;
if (isset($_POST['remember'])) {
setcookie('remember', $username, time()+86400);
}
} else {
echo 'Username or Password is incorrect.';
}
} else {
echo 'Password or username is too long or too short.';
}
} else {
echo 'All fields required';
}
}
?>
</td>
</tr>
</table>
</form>
</section>
<?php
}
?>
<section class="part">
<h1>Photos</h1>
<a href="gallery.php"><img class="slide_img" src="pictures/fall.jpg" /></a>
<div id="play_menu">
<button id="back">◄</button>
<button id="go">►</button>
</div>
<h2><a href="gallery.php">Click to Browse Gallery</a></h2>
</section>
<section class="part">
<h1>Share</h1>
<p>
<a href="https://www.facebook.com/DBCTroop416" target="_blank"><img class="share" src="pictures/fb.png" /></a>
<a href="https://twitter.com/" target="_blank"><img class="share" src="pictures/t.png" /></a>
<a href="http://instagram.com/" target="_blank"><img class="share" src="pictures/ig.jpg" /></a>
<a href="https://www.pinterest.com/" target="_blank"><img class="share" src="pictures/p.png" /></a>
</p>
</section>
<section class="part">
<h1>Scout Rules</h1>
<div class="center">
<h2>Pledge of Allegiance</h2>
<p>"I pledge allegiance to the Flag of the United States of America, and to the Republic for which it stands, one Nation under God, indivisible, with liberty and justice for all."</p>
<h2>Scout Law</h2>
<p>"A scout is trustworthy, loyal, helpful, friendly, courteous, kind, obedient, cheerful, thrifty, brave, clean, and reverent."</p>
<h2>Scout Oath</h2>
<p>"On my honor I will do my best To do my duty to God and my country and to obey the Scout Law; To help other people at all times; To keep myself Physically strong, mentally awake, and morally straight."</p>
<h2>Scout Motto</h2>
<p>"Be Prepared."</p>
<h2>Scout Slogan</h2>
<p>"Do a Good Turn daily."</p>
</div>
</section>
</div>
</div>
<footer id="foot">
<p>Version: 3.0.0</p>
<p>This website is hosted, managed, and was created by:</p>
<h1><a href="#">Biz Name</a></h1>
</footer>
</body>
</html>