I want to create a counter that users can sign up for.
http://www.mydomain.com/counter.php3?id=59
were id is the users id that will display how many hits he has.
If the user doesn't have php on his site, can he use <img src="http://www.mydomain.com/counter.php3?id=59">
The answer to your question is "YES" as long as the output of your counter script is an image stream with the correct mime type header.
-- Rich Rijnders -- Irvine, CA US
what do you mean by image stream and mime type header
can you give me an example of the output on the counter
The manual has some nice examples of how to create images.
Get it, read it, try it out.
Also, the WROX book on PHP has some great examples and explainations.