PHP简单登录脚本白页 [英] Php simple login script white page

问题描述

您好，我正在尝试将PDO植入我的登录脚本中，以使其免于sql注入.但是我得到的是白页，我想是因为我试图对行进行计数以查看用户是否真实.....

Hello im trying to implant PDO into my login script to make it safrer from sql injection. But im getting a white page i think its because im trying to count the rows to see if the user is real.....

// Here we inculde the function page
include 'functions/functions.php';
// Here we connect to the db
$db = mysqlconnect();

$password = md5($_POST['mypassword']);
$statement = $db->prepare("SELECT * FROM users WHERE username = ? AND password = ?");
$statement->execute(array($_POST['myusername'], $password));


// Replace counting function based on database you are using.
 $count = $statement->rowCount();
// If result matched $myusername and $mypassword, table row must be 1 row

if($count == 1){
  // Register $myusername, $mypassword and redirect to file "login_success.php"

$_SESSION['username'] = $myusername ;


//Test if it is a shared client
if (!empty($_SERVER['HTTP_CLIENT_IP'])){
  $ip=$_SERVER['HTTP_CLIENT_IP'];
//Is it a proxy address
}elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
  $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}else{
  $ip=$_SERVER['REMOTE_ADDR'];
}


$updateinfo=mysql_query("UPDATE `users` SET lastip ='$ip' WHERE `username` = '".$_SESSION['username']."'");
mysql_query("INSERT INTO user_log 
(username, ip) VALUES('".$_SESSION['username']."', '$ip' ) ") 
or die(mysql_error());  





header("Location: home.php");
} else {
  echo "Wrong Username or Password";
}


echo"<p> </p>";

我没有收到任何错误，只是白页.

Im not getting any error's just a white page.

这也是我所包含的功能页面

Also here is my function page which i include

    function mysqlconnect(){
     global $db;
    $host = 'localhost';
    $port = 3306; // This is the default port for MySQL
    $database = '';
    $username = '';
    $password = '';

    // Construct the DSN, or "Data Source Name".  Really, it's just a fancy name
    // for a string that says what type of server we're connecting to, and how
    // to connect to it.  As long as the above is filled out, this line is all
    // you need :)
    $dsn = "mysql:host=$host;port=$port;dbname=$database";

    // Connect!
    $db = new PDO($dsn, $username, $password);

}

推荐答案

您的代码中有几件东西令人毛骨悚然.

There's couple of things in your code that sticks in the eyeball.

如果在此处粘贴整个脚本，则将丢失session_start().我不知道您的home.php中包含什么，但是如果它的内容生成取决于$ _SESSION ['username']中的值，则永远不会发生，因为在标头重定向之后它将为空.

If you pasted the whole script here, you're missing session_start(). I don't know what's in your home.php, but if it's content generation depends on a value in $_SESSION['username'], it's never going to happen because it will be empty after the header redirection.

请参阅有关 session_start()的手册.

也如上所述:

对于大多数数据库，PDOStatement :: rowCount()不会返回受SELECT语句影响的行数.

For most databases, PDOStatement::rowCount() does not return the number of rows affected by a SELECT statement.

以防万一提到这一点.过去，我花了很多时间自己想知道这个东西.

Just in case thought to mention this. I've spent some good amount of time in the past wondering this thing myself.

您可能想看一看关于 rowCount 的手册中的示例2. a>.

You might want to take a glance at example #2 on the manual about rowCount.

当然，正如@Paul所指出的那样，如果迁移到PDO，则不应再使用mysql_query().

And of course, as @Paul already pointed, you shouldn't be using mysql_query() anymore if migrating to PDO.

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