我无法获得登录表单以正确连接与mySQL数据库的交互
我想让用户使用用户名和密码登录，并且该数据是否与数据库中的用户名匹配。当我尝试时，我没有收到任何错误，但是没有用。我在Dreamweaver中使用html和php，在phpMyAdmin中使用WAM。我将同时包括表单文档和随附的php文档：
loginpage.php
<?php
include('login.php'); // Includes Login Script
if(isset($_SESSION['login_user'])){
header("location: index.php");
}
?>
<table width="15px" border="0">
<form form action='login.php' method='POST'>
<tr>
<td>Username</td>
<td><input type="text" name="username" /></td>
</tr>
<tr>
<td>Password</td>
<td><input type="password" name="password" /></td>
</tr>
<tr>
<td><input type="submit" name="submit" value="submit"/></td>
</tr>
</form>
ogin.php
<html>
<head>
<title>Login</title>
</head>
<body>
<?php
session_start(); // Starting Session
$error=''; // Variable To Store Error Message
if (isset($_POST['submit'])) {
if (empty($_POST['username']) || empty($_POST['password'])) {
$error = "Username or Password is invalid";
}
else
{
// Define $username and $password
$username=$_POST['username'];
$password=$_POST['password'];
// Establishing Connection with Server by passing server_name, user_id and password as a parameter
$hostname= "localhost";
$database = "boost";
$username = "root";
$password = "";
$localhost = mysqli_connect($hostname, $username, $password, $database);
if(mysqli_connect_errno())
{
die("Connection Failed".mysqli_error());
}
// SQL query to fetch information of registerd users and finds user match.
$sql = "SELECT * FROM `users`";
$query = mysqli_query($localhost,$sql);
if(!$query)
{
die("Query Failed".mysqli_error($localhost));
}
$rows = mysqli_num_rows($query);
if ($rows == 1) {
$_SESSION['login_user']=$username; // Initializing Session
echo "You are now logged on!";
} else {
$error = "Username or Password is invalid";
}
mysqli_close($localhost); // Closing Connection
}
}
?>
</body>
</html>
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