Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
If you don't want to save an image. the way to do this is to have PHP either generate a HTML page or the image.
The image link in the PHP generated HTML page would call the PHP to generate a image as a separate download.
The PHP can be either separate PHP programs, or the same program with different HTTP arguments. As long as the right header and the right output (html or jpeg) is output, you should have no problems.
This way you do not have to save the image, as such do you have timing, permission, update, or cleanup problems in handling the image displayed on the HTML page. Everything is generated as needed.
If the generated image does not change on updates, you may like to add 'cache' header items, so image gets stored in web caches and/or the user the machine, for future use.