URL Rewriting for PHP script on an image URL

Try the following at the top of the .htaccess file, before the existing WordPress directives:

# Internally rewrite "/image.jpg" to "/randomizer.php"
RewriteRule ^image\.jpg$ randomizer.php [L]

This uses mod_rewrite to rewrite the URL. There is no need to repeat the RewriteEngine On directive (that occurs later in the file).

Any request for /image.jpg (in the document root) is internally/silently rewritten to your /randomizer.php PHP script (also in the document root – assuming that is where your .htaccess file is located, or where the RewriteBase directive points to).

I have a weird request maybe

This isn’t weird at all. In fact, using URL-rewriting like this is probably preferable to linking directly to your PHP script. Although calling the URL random-image.jpg or something similar maybe a good idea.

This is actually pretty much identical to a question I answered yesterday on StackOverflow:
https://stackoverflow.com/questions/63340667/htaccess-redirect-one-file-to-another-including-query-string

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