title: Zip files contain same files but have different hashes?
body: <p>I have created hundreds of folders and text files using php, I then add them to a zip archive. </p>
  
  <p>This all works fine but if I create another zip archive using the same folders and files, the new archive will have a different hash to the first one. This is the same if I use winrar instead of php to create an archive.</p>
  
  <p>It only seems to show different hashes when I zip the files I have created through php, yet they open fine.</p>
  
  <p>Very strange anyone shed any light on this?</p>
  
  <p>Thanks</p>