What potential issues can arise when trying to include a PHP script in an HTML document using <img> tags?

One potential issue that can arise when trying to include a PHP script in an HTML document using <img> tags is that the PHP code will not be executed as expected because <img> tags are meant for displaying images, not executing PHP scripts. To solve this issue, you can use the PHP readfile() function to read the contents of the PHP script and output it directly into the HTML document.

<img src="<?php readfile('path/to/your/php/script.php'); ?>" />