Detect when image (or any type of file) is accessed from site and notify via email

I plan on adding a logo image to an email newsletter and use it as a tracking image. This image wil开发者_StackOverflow中文版l be hosted on my site (eg. my_logo.gif) and referenced in the html of the email (eq. <img src="http://www.example.com/my_logo.gif" />). I would like to create a script in php that emails me when that image is accessed/viewed. Is this possible? If so, how?

All ideas and suggestions to complete this are welcome.

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Put something like this in an .htaccess file in the image directory:

RewriteEngine On
RewriteRule ^(.+\.jpg)$ image.php?image=$1 [nocase]

Put something like this into a file image.php in the same directory:

// send email here

header('Content-Type: image/jpeg');
readfile($_GET['image']);

This is only a simple example, make sure you validate the $_GET['image'] variable to make sure it's an image in the same directory, otherwise someone might be able to abuse this script to read files in other directories (image.php?image=../../../passwords).

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//Display image
$image=imagecreatefromjpeg('my_logo.jpg');
header('Content-Type: image/jpeg');
imagejpeg($image);

//logging or notifying stuff here
// ...

and just link to this script like <img src="script.php" />

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You can redirect the request to an .jpg file via .htaccess and count it etc.

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You can achieve this by using the readfile() function and sending the proper content-type headers. You can execute other program code before or after the image is sent to the browser.

If the following program code has a long execution time, you will want to look into the output control functions.

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It would probably be easier to link to the php file and have that forward or present the image itself AND count/track/email you whenever the php file is accessed.