Unzip and compare/delete multiple .txt files on weekly basis with php
<p>Looking for some ideas on how to accomplish this.</p>

<p>Every week I get a zip of about 10-15 text files, always with the same filenames. The files contain comma separated values. (the overall size of all the files, under 20mb).</p>

<p>I need to compare the contents of each text file in the zip on a weekly basis. If there is no difference basically do nothing, if there is a change replace the older files with the new ones, and also output the changes to a text file.</p>
