what can i do with "img src"

is there anything i can do with with a php file by calling it through <img src=whatever.php>
the only thing ive seen done is generating images but i think that needs some gd library or something. I don't have that so is it possible to do anything else like putting an image or text or anything?

The img tag only alows an output that links to an image.

But you can do many things in the script before your image output. Such as logging user information, or a randomizing a link, as long as it does not return a value, and an image is the output, you can do everything.

how can i make an image output without that labrary that i was talking about?

PHP Code:

---


<?php
header("Location: yourpic.jpg");

//your code

?>

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make sure nothing is outputing before or after the header.