用户已登录帐户信息中心的受保护页面，现在我想从数据库中显示某个表。这需要我使用mysqli_query。但它显示错误。
db_connect.php
$mysqli = new mysqli(HOST, USER, PASSWORD, DATABASE);
if ($mysqli->connect_error) {
header("Location: ../error.php?err=Unable to connect to MySQL");
exit();
}
function.php
<?php
include_once 'psl-config.php';
function sec_session_start() {
$session_name = 'sec_session_id'; // Set a custom session name
$secure = SECURE;
// This stops JavaScript being able to access the session id.
$httponly = true;
// Forces sessions to only use cookies.
if (ini_set('session.use_only_cookies', 1) === FALSE) {
header("Location: ../error.php?err=Could not initiate a safe session (ini_set)");
exit();
}
// Gets current cookies params.
$cookieParams = session_get_cookie_params();
session_set_cookie_params($cookieParams["lifetime"], $cookieParams["path"], $cookieParams["domain"], $secure, $httponly);
// Sets the session name to the one set above.
session_name($session_name);
session_start(); // Start the PHP session
session_regenerate_id(); // regenerated the session, delete the old one.
}
function login($email, $password, $mysqli) {
// Using prepared statements means that SQL injection is not possible.
if ($stmt = $mysqli->prepare("SELECT user_id, username, password, salt
FROM *****
WHERE email = ? LIMIT 1")) {
$stmt->bind_param('s', $email); // Bind "$email" to parameter.
$stmt->execute(); // Execute the prepared query.
$stmt->store_result();
// get variables from result.
$stmt->bind_result($user_id, $username, $db_password, $salt);
$stmt->fetch();
// hash the password with the unique salt.
$password = hash('sha512', $password . $salt);
if ($stmt->num_rows == 1) {
// If the user exists we check if the account is locked
// from too many login attempts
if (checkbrute($user_id, $mysqli) == true) {
// Account is locked
// Send an email to user saying their account is locked
return false;
} else {
// Check if the password in the database matches
// the password the user submitted.
if ($db_password == $password) {
// Password is correct!
// Get the user-agent string of the user.
$user_browser = $_SERVER['HTTP_USER_AGENT'];
// XSS protection as we might print this value
$user_id = preg_replace("/[^0-9]+/", "", $user_id);
$_SESSION['user_id'] = $user_id;
// XSS protection as we might print this value
$username = preg_replace("/[^a-zA-Z0-9_\-]+/", "", $username);
$_SESSION['username'] = $username;
$_SESSION['login_string'] = hash('sha512', $password . $user_browser);
// Login successful.
return true;
} else {
// Password is not correct
// We record this attempt in the database
$now = time();
if (!$mysqli->query("INSERT INTO login_attempts(user_id, time)
VALUES ('$user_id', '$now')")) {
header("Location: ../error.php?err=Database error: login_attempts");
exit();
}
return false;
}
}
} else {
// No user exists.
return false;
}
} else {
// Could not create a prepared statement
header("Location: ../error.php?err=Database error: cannot prepare statement");
exit();
}
}
function checkbrute($user_id, $mysqli) {
// Get timestamp of current time
$now = time();
// All login attempts are counted from the past 2 hours.
$valid_attempts = $now - (2 * 60 * 60);
if ($stmt = $mysqli->prepare("SELECT time
FROM login_attempts
WHERE user_id = ? AND time > '$valid_attempts'")) {
$stmt->bind_param('i', $user_id);
// Execute the prepared query.
$stmt->execute();
$stmt->store_result();
// If there have been more than 5 failed logins
if ($stmt->num_rows > 5) {
return true;
} else {
return false;
}
} else {
// Could not create a prepared statement
header("Location: ../error.php?err=Database error: cannot prepare statement");
exit();
}
}
function login_check($mysqli) {
// Check if all session variables are set
if (isset($_SESSION['user_id'], $_SESSION['username'], $_SESSION['login_string'])) {
$user_id = $_SESSION['user_id'];
$login_string = $_SESSION['login_string'];
$username = $_SESSION['username'];
// Get the user-agent string of the user.
$user_browser = $_SERVER['HTTP_USER_AGENT'];
if ($stmt = $mysqli->prepare("SELECT password
FROM ******
WHERE user_id = ? LIMIT 1")) {
// Bind "$user_id" to parameter.
$stmt->bind_param('i', $user_id);
$stmt->execute(); // Execute the prepared query.
$stmt->store_result();
if ($stmt->num_rows == 1) {
// If the user exists get variables from result.
$stmt->bind_result($password);
$stmt->fetch();
$login_check = hash('sha512', $password . $user_browser);
if ($login_check == $login_string) {
// Logged In!!!!
return true;
} else {
// Not logged in
return false;
}
} else {
// Not logged in
return false;
}
} else {
// Could not prepare statement
header("Location: ../error.php?err=Database error: cannot prepare statement");
exit();
}
} else {
// Not logged in
return false;
}
}
function esc_url($url) {
if ('' == $url) {
return $url;
}
$url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url);
$strip = array('%0d', '%0a', '%0D', '%0A');
$url = (string) $url;
$count = 1;
while ($count) {
$url = str_replace($strip, '', $url, $count);
}
$url = str_replace(';//', '://', $url);
$url = htmlentities($url);
$url = str_replace('&', '&', $url);
$url = str_replace("'", ''', $url);
if ($url[0] !== '/') {
// We're only interested in relative links from $_SERVER['PHP_SELF']
return '';
} else {
return $url;
}
}
'psl-config.php'包含与DEFINE的连接记录
protected_page.php更新
<?php
include_once 'includes/db_connect.php';
include_once 'includes/functions.php';
sec_session_start();
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Secure Login: Protected Page</title>
<link rel="stylesheet" href="styles/main.css" />
</head>
<body>
<?php if (login_check($mysqli) == true) : ?>
<p>Welcome <?php echo htmlentities($_SESSION['username']); ?>!</p>
<p>
This is an example protected page. To access this page, users
must be logged in. At some stage, we'll also check the role of
the user, so pages will be able to determine the type of user
authorised to access the page.
</p>
<?php
$user_id = htmlentities($_SESSION['user_id']);
// Check connection
if ($mysqli->connect_error) {
die("Connection failed: " . $mysqli->connect_error);
// showing added broker
$result= mysqli_query($mysqli,"SELECT accountno,*****,*****,***** FROM *** WHERE user_id = $user_id");
echo "<table border='1'>
<tr>
<th>Account No</th>
<th>******</th>
<th>*****</th>
<th>****</th>
</tr>";
while($row = mysqli_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['****'] . "</td>";
echo "<td>" . $row['****'] . "</td>";
echo "<td>" . $row['*****'] . "</td>";
echo "<td>" . $row['*****'] . "</td>";
echo "</tr>";
}
echo "</table>";
$mysqli->close();
?>
<p>Return to <a href="index.php">login page</a></p>
<?php else : ?>
<p>
<span class="error">You are not authorized to access this page.</span> Please <a href="index.php">login</a>.
</p>
<?php endif; ?>
</body>
</html>
这给了我一个错误
警告：mysqli_fetch_array（）期望参数1为mysqli_result，boolean 为protected_page.php行代码
生成了此错误while（$ row = mysqli_fetch_array（$ result））
尝试2：使用mysqli prepare语句： https://pastebin.com/2WzDg9zs
在此行“$ brmt-＆gt; bind_param（'s'，$ user_id）;”
上显示“在boolean上调用成员函数bind_param（）”时出错尝试3：解决了错误。表名错了。所以我纠正了它。但现在没有在桌子上显示数据。用fetch（）绘制表格。但那里没有数据？ 这是代码：
$stmt = $mysqli->prepare('SELECT accountno,accountname,cname,revenue,status FROM ***** WHERE user_id = ? ');
$stmt->bind_param('i', $user_id);
$stmt->bind_result($accountno ,$accountname, $cname, $revenue,$status);
$stmt->execute(); // Execute the prepared query.
echo "<table border='1'>
<tr>
<th>Account No</th>
<th>Account Name</th>
<th>Company Name</th>
<th>Revenue</th>
<th>Status</th>
</tr>";
while($row = $stmt->fetch()) {
echo "<tr>";
echo "<td>" . $row['accountno'] . "</td>";
echo "<td>" . $row['accountname'] . "</td>";
echo "<td>" . $row['cname'] . "</td>";
echo "<td>" . $row['revenue'] . "</td>";
echo "<td>" . $row['status'] . "</td>";
echo "</tr>";
}
$stmt->close();
echo "</table>";
答案 0 :(得分：0)
$link = mysqli_connect("127.0.0.1", "my_user", "my_password", "my_db");
您需要先连接到mysql数据库。然后你可以看看它是否连接。并执行查询。
if(!$link) {echo "Connection Error"; }