How to get PHP code embedded in a database to run

So, here's the scoop:

I have a file upload script which generically encodes any file I upload
into a series of BLOB fields in a database.

I then use a PHP script to emulate that file when requested. (so an <img>
tag, for example, might link to file_push.php?choice=1, which is a script
that pulls the data from the table, and echoes it, after the appropriate
header, out to the browser, thus creating an image.)

In general, it works fine, BUT I would like to be able to upload a PHP
script in the same fashion and then execute that script when requested.

I have tried include(file_push.php?choice=1) and
file(file_push.php?choice=1) and both give me an error indicating the file
doesn't exist. Any suggestions?

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