AdWords 严重误报点击次数 - 第三方跟踪页面丢失了 50% 的点击次数

Question

我为几个客户管理 AdWords 帐户。我使用自己的自定义跟踪链接放置在 AdWords 目标网址框中用于客户的广告（例如：http://www.mywebsite.com/track.php?id=1234567890）。

此链接指向一个简单的 PHP 页面，该页面记录 IP 地址，在远程机器上放置一个 cookie，并将所有内容保存到 mysql 数据库中。然后它将用户转发到客户端的登录页面。

问题是，AdWords 会报告 10 次点击，但我的 PHP 跟踪页面只报告 5 次。为什么我的跟踪页面缺少这么多点击？

-在过去 30 天内，我的服务器正常运行时间是 100%。

-我的服务器启用了错误报告。没有记录错误。

-我的代码：

<?php

//determine which client/campaign this belongs to by reading get id from URL
if (isset($_GET['id'])) {
    $tracker_id = $_GET['id'];
} else {
   exit('Sorry, that ID is invalid.');
}

//if referrer is same page we just forwarded to, prevent rest of code from running to prevent redirect loop:
if (isset($_SERVER['HTTP_REFERER'])) {
    if ($_SERVER['HTTP_REFERER'] == 'http://www.clientshomepage.com') {
        //stop running script and send user back to where they originally came from:
        echo '<script type="text/javascript">window.history.go(-1);</script>';
        exit();
    }   
} 

//check to see if remote machine already has cookie set:
if (!isset($_COOKIE[$tracker_id])) {
    //create tracking id:
    $cookie_id = mt_rand(100000000, 999999999); 
    //insert unique ID into cookie and place on remote machine:
    setcookie($tracker_id, $cookie_id, time() + (86400 * 365), "/");
} else {
    $cookie_id = $_COOKIE[$tracker_id];
}

//log the IP address of the person clicking:
if (isset($_SERVER['REMOTE_ADDR'])) {
    $remote_addr = $_SERVER['REMOTE_ADDR'];
} else {
    $remote_addr = '';
}

//include pdo/mysql credentials file:
require('pdo.php');

//insert collected data about this click into the database:
try {


    $sql = "INSERT INTO mytable_name (tracker_id, cookie_id, remote_addr, click_time) 
            VALUES (:tracker_id, :cookie_id, INET_ATON(:remote_addr), :click_time)";

    $stmt = $pdo->prepare($sql);

    $stmt->execute( 
            array( 
            ':tracker_id'               => $tracker_id,
            ':cookie_id'                => $cookie_id,
            ':remote_addr'              => $remote_addr,
            ':click_time'               => time()
            ) 
        );

    $stmt = null;   

} catch (PDOException $err) {
    exit('Error Number: ' . $err->getCode() . '<br>' . 'Sorry, there was a database error. Please notify technical support.');
}

//forward user to landing page:
echo '<script>window.location = "http://www.clientslandingpage.com"</script>';


//in case redirect fails due to disabled javascript, redirect user old school style:
echo '<meta http-equiv="refresh" content="3;url=http://www.clientslandingpage.com"/>';

?>

Answer 1

插入到数据库的页面可能会被缓存。因此，元重定向到 adwords 正在工作，因为浏览器缓存了它，但您的服务器没有被命中，因此它无法保存到数据库。您可以尝试添加一些无缓存标头，例如：

header("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
header("Pragma: no-cache");

（假设您缺少的是来自同一用户的多次点击。）