Php echo$\u会话已中断
当我运行该站点时，它会消失：Php echo$\u会话已中断,php,session,Php,Session,当我运行该站点时，它会消失： <?php echo $_SESSION["UserID"]; ?> 而不是实际的会话id 以下是整个脚本： <?php require 'Connections/Connections.php'; ?> <?php session_start(); ?> <!doctype html> <html> <head> <meta charset="utf-8"> <tit
<?php
echo $_SESSION["UserID"];
?>
<?php require 'Connections/Connections.php'; ?>
<?php
session_start();
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Titled Document</title>
<link href="C:/Users/Mikkel/Desktop/HTML & CSS/bootstrap.css" rel="stylesheet" />
<link href="CSS/Layout.css" rel="stylesheet" type="text/css" />
<link href="CSS/Menu.css" rel="stylesheet" type="text/css" />
</head>
<body>
<br><?php echo $_SESSION["UserID"]; ?>
<div id="Holder">
<div id="Header"></div>
<div id="NavBar">
<nav>
<ul>
<li><a href="#">Login</a></li>
<li><a href="#">Register</a></li>
<li><a href="#">Forgot Password</a></li>
</ul>
</nav>
</div>
<div id="Content">
<div id="PageHeading">
<h1>Page Heading</h1>
</div>
<div id="ContentLeft">
</div>
<div id="ContentRight"></div>
</div>
<div id="Footer"></div>
</div>
</body>
</html>
标题文件
页眉
<?php require 'Connections/Connections.php'; ?>
<?php
if(isset($_POST['submit'])){
$UN = $_POST['username'];
$PW = $_POST['password'];
$result = $con->query("select * from user where Username='$UN' AND Password='$PW'");
$row = $result->fetch_array(MYSQLI_BOTH);
session_start();
$_SESSION["UserID"] = $row['UserID'];
header('Location: account.php');
}
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<link href="C:\Users\Mikkel\Desktop\HTML & CSS" rel="stylesheet" />
<link href="CSS/Layout.css" rel="stylesheet" type="text/css" />
<link href="CSS/Menu.css" rel="stylesheet" type="text/css" />
<link href="CSS/Bootstrap.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="Holder">
<div id="Header"></div>
<div id="NavBar">
<nav>
<ul>
<li><a href="#">Login</a></li>
<li><a href="#">Register</a></li>
<li><a href="#">Forgot Password</a></li>
</ul>
</nav>
</div>
<div id="Content">
<div id="PageHeading">
<h1>Page Heading</h1>
</div>
<div id="ContentLeft">
<h2>Your Message Here </h2><br />
<h6>Your Message</h6>
</div>
<div id="ContentRight">
<form id="form1" name="form1" method="post">
<div class="FormElement">
<p>
<input name="text" type="text" required="required" id="username" placeholder="Username">
</p>
<p> </p>
</div>
<div class="FormElement">
<p>
<input name="password" type="password" required="required" id="password" placeholder="Password">
</p>
<p> </p>
</div>
<div class="FormElement">
<p>
<input name="submit" type="submit" class="btn-primary" id="submit" value="Submit">
</p>
<p> </p>
</div>
</form>
</div>
</div>
<div id="Footer"></div>
</div>
</body>
</html>
<> P>通常是在文档开始时而不是在中间开始会话的最佳实践。但是，您的问题是，当您进行查询时，它不会引入变量$UN和$PW。因为你是用一个“
开始的，所以PHP不会解析它的内部。你可以用：“select*from user where Username='”“$UN.”和Password='“$PW.”“
因此，会话从未正确设置。
但是，由于上述方法是非常规的，而且您正在进行身份验证，因此您应该使用准备好的语句。因为您从未启动过会话
如果您这样说的话，好的。
<?php require 'Connections/Connections.php'; ?>
<?php
session_start();
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Titled Document</title>
<link href="C:/Users/Mikkel/Desktop/HTML & CSS/bootstrap.css" rel="stylesheet" />
<link href="CSS/Layout.css" rel="stylesheet" type="text/css" />
<link href="CSS/Menu.css" rel="stylesheet" type="text/css" />
</head>
<body>
<br><?php echo $_SESSION["UserID"]; ?>
<div id="Holder">
<div id="Header"></div>
<div id="NavBar">
<nav>
<ul>
<li><a href="#">Login</a></li>
<li><a href="#">Register</a></li>
<li><a href="#">Forgot Password</a></li>
</ul>
</nav>
</div>
<div id="Content">
<div id="PageHeading">
<h1>Page Heading</h1>
</div>
<div id="ContentLeft">
</div>
<div id="ContentRight"></div>
</div>
<div id="Footer"></div>
</div>
</body>
</html>
<?php require 'Connections/Connections.php'; ?>
<?php
if(isset($_POST['submit'])){
$UN = $_POST['username'];
$PW = $_POST['password'];
$result = $con->query("select * from user where Username='$UN' AND Password='$PW'");
$row = $result->fetch_array(MYSQLI_BOTH);
session_start();
$_SESSION["UserID"] = $row['UserID'];
header('Location: account.php');
}
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<link href="C:\Users\Mikkel\Desktop\HTML & CSS" rel="stylesheet" />
<link href="CSS/Layout.css" rel="stylesheet" type="text/css" />
<link href="CSS/Menu.css" rel="stylesheet" type="text/css" />
<link href="CSS/Bootstrap.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="Holder">
<div id="Header"></div>
<div id="NavBar">
<nav>
<ul>
<li><a href="#">Login</a></li>
<li><a href="#">Register</a></li>
<li><a href="#">Forgot Password</a></li>
</ul>
</nav>
</div>
<div id="Content">
<div id="PageHeading">
<h1>Page Heading</h1>
</div>
<div id="ContentLeft">
<h2>Your Message Here </h2><br />
<h6>Your Message</h6>
</div>
<div id="ContentRight">
<form id="form1" name="form1" method="post">
<div class="FormElement">
<p>
<input name="text" type="text" required="required" id="username" placeholder="Username">
</p>
<p> </p>
</div>
<div class="FormElement">
<p>
<input name="password" type="password" required="required" id="password" placeholder="Password">
</p>
<p> </p>
</div>
<div class="FormElement">
<p>
<input name="submit" type="submit" class="btn-primary" id="submit" value="Submit">
</p>
<p> </p>
</div>
</form>
</div>
</div>
<div id="Footer"></div>
</div>
</body>
</html>