I have a text box on my webpage. Users can input text there which I later process by a PHP file and save on my server.
Does a jquery plugin exists which will upload files for me and when I go back to my webpage I can see the files previously uploaded and can run my previous php file on the contents of any selected and previously uploaded file?
File uploads are handled server-side, in PHP in your case, not client-side in jquery. You can read about them in the PHP manual .
What you do with them, once they are on the server, is up to you - so you can make your page display previously uploaded files, or process them in some way.
You mean something like this? blueimp.github.com/jQuery-File-Upload/
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