title: Is it possible to run a php code on every html file using htaccess, or similar?
body: <p>So i made a site that allows users to create their own site, with stuff like wysiswyg editors etc.
  When they register they get an url like user.site.com
  and they can create files, folders, upload files etc, they can create and edit html files, example if someone created index.html = user.site.com/index.html they can edit that with my site tools, and access it through user.site.com/index.html, i just want to know if i can append a php code to all the html files they create without actually adding content to the file.
  Like </p>
  
  <p>echo 'Created with AppName';</p>
  
  <p>would automatically be added to all the html files  that every user created without actually being inside it, can htaccess do this?</p>