如何找出文件下载次数？

Question

I have an image that send to affiliate for advertising. so, how can I find it out from my server the number of times that image been downloaded? does server log keep track of image upload count?

---- Addition ---- Thanks for the reply.. few more questions

because I want to do ads rotation, and tracking IP address, etc. so, i think I should do it by making a dynamic page (php) and return the proper images, right?

In this case, is there anyway that I can send that information to Google Analytics from the server? I know I can do it in javascript. but now, since the PHP should just return the images file. so what I should do? :)

Answer 1

Well This can be done irrespective of your web Server or Language / Platform.

Assuming the File is Physically stored in a Certain Directory. Write a program that somehow gets to know which file has to be downloaded. Through GET/POST parameters. There can be even more ways. then point that particullar file physically.

fopen that file
  read through it byte by byte
  print them
fclose
store/increment/updatethe download counter in database/flatfile

and in the database you may keep the record as md5checksum -> downloadCounter