title: Codeigniter Zip Library how to zip existent file
body: <p>Im moving un-zipped files to a server directory  /zip/file.unzipped.png</p>
  
  <p>now i need to take that file and zip it.</p>
  
  <p>Is it possible to do that or a need the zip archive as codeigniter guide says?</p>
  
  <p>How can i do that?</p>