如何检测使用PHP打开的邮件是否已打开，在哪个浏览器（用户代理）和OS中打开？

Question

在我的公司中，我们通常用于发送邮件，我们希望静态地打开邮件，并希望使用PHP从哪个浏览器打开邮件（更多信息）。

Answer 1

You can do this by adding image in your HTML email

<img src="https://example.com/images/YOUR_LOGO__uc_12245.png" />

But this url https://example.com/images/YOUR_LOGO__uc_12245.png must be handled by your scripts (PHP) where you can check headers of request and at the end just return requested image as normal. Some services do that way. In uc_12245 you can store id of your user, for example.

But remember, this is will not work every time, for example with Gmail, because Gmail show your image via proxy ( it needs to be tested, maybe it still will work ).