不确定这里发生了什么，但是每当我将代码输入到我的页面中时，它都会崩溃，我试图从我的mysql表中提取数据，每次它都崩溃了。我尝试了几个代码以及不同的位置
在页面的最顶部：
include 'dbc.php';
page_protect();
$query = "
SELECT
id,
user_name,
suta,
FROM users
";
try
{
$stmt = $db->prepare($query);
$stmt->execute();
}
catch(PDOException $ex)
{
die("Failed to run query: " . $ex->getMessage());
}
$rows = $stmt->fetchAll();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Account Page</title>
以及我想要显示数据的正文：
<div id="memdocs">
<p>Pending Documents</p>
<?php
$query = "
SELECT
id,
user_name,
suta,
FROM users
";
try
{
$stmt = $db->prepare($query);
$stmt->execute();
}
catch(PDOException $ex)
{
die("Failed to run query: " . $ex->getMessage());
}
$rows = $stmt->fetchAll();
?>
<p><?php echo htmlentities($rows['user_name'], ENT_QUOTES, 'UTF-8'); ?></p>
<p><?php echo htmlentities($rows['suta'], ENT_QUOTES, 'UTF-8'); ?></p>
</div>
这是页面保护功能
function page_protect() {
session_start();
global $db;
/* Secure against Session Hijacking by checking user agent */
if (isset($_SESSION['HTTP_USER_AGENT']))
{
if ($_SESSION['HTTP_USER_AGENT'] != md5($_SERVER['HTTP_USER_AGENT']))
{
logout();
exit;
}
}
dbc.php
<?php
define ("DB_HOST", "localhost"); // set database host
define ("DB_USER", "trin6_slogin"); // set database user
define ("DB_PASS","Father11!!"); // set database password
define ("DB_NAME","trin6_slogin"); // set database name
$link = mysql_connect(DB_HOST, DB_USER, DB_PASS) or die("Couldn't make connection.");
$db = mysql_select_db(DB_NAME, $link) or die("Couldn't select database");
/* Registration Type (Automatic or Manual)
1 -> Automatic Registration (Users will receive activation code and they will be automatically approved after clicking activation link)
0 -> Manual Approval (Users will not receive activation code and you will need to approve every user manually)
*/
$user_registration = 1; // set 0 or 1
define("COOKIE_TIME_OUT", 10); //specify cookie timeout in days (default is 10 days)
define('SALT_LENGTH', 9); // salt for password
//define ("ADMIN_NAME", "admin"); // sp
/* Specify user levels */
define ("ADMIN_LEVEL", 5);
define ("USER_LEVEL", 1);
define ("GUEST_LEVEL", 0);
/**** PAGE PROTECT CODE ********************************
This code protects pages to only logged in users. If users have not logged in then it will redirect to login page.
If you want to add a new page and want to login protect, COPY this from this to END marker.
Remember this code must be placed on very top of any html or php page.
********************************************************/
function page_protect() {
session_start();
global $db;
/* Secure against Session Hijacking by checking user agent */
if (isset($_SESSION['HTTP_USER_AGENT']))
{
if ($_SESSION['HTTP_USER_AGENT'] != md5($_SERVER['HTTP_USER_AGENT']))
{
logout();
exit;
}
}
// before we allow sessions, we need to check authentication key - ckey and ctime stored in database
/* If session not set, check for cookies set by Remember me */
if (!isset($_SESSION['user_id']) && !isset($_SESSION['user_name']) )
{
if(isset($_COOKIE['user_id']) && isset($_COOKIE['user_key'])){
/* we double check cookie expiry time against stored in database */
$cookie_user_id = filter($_COOKIE['user_id']);
$rs_ctime = mysql_query("select `ckey`,`ctime` from `users` where `id` ='$cookie_user_id'") or die(mysql_error());
list($ckey,$ctime) = mysql_fetch_row($rs_ctime);
// coookie expiry
if( (time() - $ctime) > 60*60*24*COOKIE_TIME_OUT) {
logout();
}
/* Security check with untrusted cookies - dont trust value stored in cookie.
/* We also do authentication check of the `ckey` stored in cookie matches that stored in database during login*/
if( !empty($ckey) && is_numeric($_COOKIE['user_id']) && isUserID($_COOKIE['user_name']) && $_COOKIE['user_key'] == sha1($ckey) ) {
session_regenerate_id(); //against session fixation attacks.
$_SESSION['user_id'] = $_COOKIE['user_id'];
$_SESSION['user_name'] = $_COOKIE['user_name'];
/* query user level from database instead of storing in cookies */
list($user_level) = mysql_fetch_row(mysql_query("select user_level from users where id='$_SESSION[user_id]'"));
$_SESSION['user_level'] = $user_level;
$_SESSION['HTTP_USER_AGENT'] = md5($_SERVER['HTTP_USER_AGENT']);
} else {
logout();
}
} else {
header("Location: login.php");
exit();
}
}
}
function filter($data) {
$data = trim(htmlentities(strip_tags($data)));
if (get_magic_quotes_gpc())
$data = stripslashes($data);
$data = mysql_real_escape_string($data);
return $data;
}
function EncodeURL($url)
{
$new = strtolower(ereg_replace(' ','_',$url));
return($new);
}
function DecodeURL($url)
{
$new = ucwords(ereg_replace('_',' ',$url));
return($new);
}
function ChopStr($str, $len)
{
if (strlen($str) < $len)
return $str;
$str = substr($str,0,$len);
if ($spc_pos = strrpos($str," "))
$str = substr($str,0,$spc_pos);
return $str . "...";
}
function isEmail($email){
return preg_match('/^\S+@[\w\d.-]{2,}\.[\w]{2,6}$/iU', $email) ? TRUE : FALSE;
}
function isUserID($username)
{
if (preg_match('/^[a-z\d_]{5,20}$/i', $username)) {
return true;
} else {
return false;
}
}
function isURL($url)
{
if (preg_match('/^(http|https|ftp):\/\/([A-Z0-9][A-Z0-9_-]*(?:\.[A-Z0-9][A-Z0-9_-]*)+):?(\d+)?\/?/i', $url)) {
return true;
} else {
return false;
}
}
function checkPwd($x,$y)
{
if(empty($x) || empty($y) ) { return false; }
if (strlen($x) < 4 || strlen($y) < 4) { return false; }
if (strcmp($x,$y) != 0) {
return false;
}
return true;
}
function GenPwd($length = 7)
{
$password = "";
$possible = "0123456789bcdfghjkmnpqrstvwxyz"; //no vowels
$i = 0;
while ($i < $length) {
$char = substr($possible, mt_rand(0, strlen($possible)-1), 1);
if (!strstr($password, $char)) {
$password .= $char;
$i++;
}
}
return $password;
}
function GenKey($length = 7)
{
$password = "";
$possible = "0123456789abcdefghijkmnopqrstuvwxyz";
$i = 0;
while ($i < $length) {
$char = substr($possible, mt_rand(0, strlen($possible)-1), 1);
if (!strstr($password, $char)) {
$password .= $char;
$i++;
}
}
return $password;
}
function logout()
{
global $db;
session_start();
$sess_user_id = strip_tags(mysql_real_escape_string($_SESSION['user_id']));
$cook_user_id = strip_tags(mysql_real_escape_string($_COOKIE['user_id']));
if(isset($sess_user_id) || isset($cook_user_id)) {
mysql_query("update `users`
set `ckey`= '', `ctime`= ''
where `id`='$sess_user_id' OR `id` = '$cook_user_id'") or die(mysql_error());
}
/************ Delete the sessions****************/
unset($_SESSION['user_id']);
unset($_SESSION['user_name']);
unset($_SESSION['user_level']);
unset($_SESSION['HTTP_USER_AGENT']);
session_unset();
session_destroy();
/* Delete the cookies*******************/
setcookie("user_id", '', time()-60*60*24*COOKIE_TIME_OUT, "/");
setcookie("user_name", '', time()-60*60*24*COOKIE_TIME_OUT, "/");
setcookie("user_key", '', time()-60*60*24*COOKIE_TIME_OUT, "/");
header("Location: login.php");
}
// Password and salt generation
function PwdHash($pwd, $salt = null)
{
if ($salt === null) {
$salt = substr(md5(uniqid(rand(), true)), 0, SALT_LENGTH);
}
else {
$salt = substr($salt, 0, SALT_LENGTH);
}
return $salt . sha1($pwd . $salt);
}
function checkAdmin() {
if($_SESSION['user_level'] == ADMIN_LEVEL) {
return 1;
} else { return 0 ;
}
}
?>
我做错了吗？这不是我尝试过的唯一代码。有人可以指出我正确的方向吗
答案 0 :(得分：2)
在dbc.php中
$link = mysql_connect(DB_HOST, DB_USER, DB_PASS) or die("Couldn't make connection.");
$db = mysql_select_db(DB_NAME, $link) or die("Couldn't select database");
在您的代码中
try
{
$stmt = $db->prepare($query);
$stmt->execute();
}
catch(PDOException $ex)
{
die("Failed to run query: " . $ex->getMessage());
}
您正在使用PDO混合（已弃用）mysql_*个函数;此外，mysql_select_db()只是选择数据库并返回一个布尔值，因此$db->prepare()等于true->prepare()，这就是为什么你得到一个关于$db不是对象的错误。< / p>
尝试将 dbc.php 中的连接设置更改为：
try {
$sDSN = "mysql:dbname=" . DB_NAME. ";host= " . DB_HOST;
$db = new PDO($sDSN, DB_USER, DB_PASS);
}
catch(PDOException $e) {
die($e->getMessage());
}