跟踪电子邮件与PHP和图像 [英] Tracking email with PHP and image

问题描述

我已经看到像spypig.com这样的服务，在电子邮件中放置一个小图像，并在打开时跟踪它。他们跟踪城市，国家，IP地址等。这是如何完成的？

I have seen the service like spypig.com placing a small image in the email and tracking when it is opened and from where. They track city, country, IP address etc. How is this done?

1. 我们如何知道邮件何时打开？图形
   如何生成？


2. 如何检测到IP地址，如何从
   了解位置？

推荐答案

基本上，在电子邮件的HTML正文中，将有一个< img> 标签，如下所示：

Basically, in the HTML body of your email, there will be an <img> tag that would look like this :

<img src="http://www.yoursite.com/tracker.php?id=123456" alt="" />

当有人读取邮件时，启用了图像，电子邮件客户端将向 tracker.php ，以加载图像，将其 id = 123456 作为参数。

When someone reads his mail, with images enabled, the email-client will send a request to tracker.php, to load the image, passing it id=123456 as a parameter.

这个 tracker.php 脚本将在您的服务器上，当被调用时，它将：

This tracker.php script will be on your server, and, when called, it will :

• 查看 id 参数


• 使用它找到它对应的电子邮件地址 - 当为每个订阅者生成电子邮件时，您将生成每个电子邮件的 id
。 >

• 做一些东西，如日志电子邮件123456已经打开，另外一些附加信息


• 返回一个小图像像一个1x1透明的gif。

• Check the id parameter,
• Use it to find to which email address it corresponds -- when generating the email for each one of your subscribers, you'll have generated an id different for each e-mail.
• Do some stuff -- like log "email 123456 has been opened", and some additional informations
• return the content of a small image ; like a 1x1 transparent gif.

tracker.php 脚本知道从哪个IP地址被调用 - 像任何其他PHP脚本：

The tracker.php script knows from which IP address it's been called -- like any other PHP script :

$ipAddress = $_SERVER['REMOTE_ADDR'];

从这个IP地址开始，您可以使用地理位置服务来查找世界的电子邮件已经打开。

作为几个例子，您可以查看 MaxMind 或 IPInfoDB

And, starting from this IP address, you can use a geolocation service to find out from where in the world the email has been opened.
As a couple of examples, you could take a look at MaxMind, or IPInfoDB

如你所知， id = 123456 对应一个特定的电子邮件地址，这样可以找出您的每个订阅者的位置。

As you know that id=123456 corresponds to one specific email address, this allows to find out where each one of your subscribers are.

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