title: php get date -1 month
body: <p>So here is the situation. In my db table i have a column called expire_date, where i put a certain date for each row. 
  So for example the expire date is 28-04-2012</p>
  
  <p>I need a php code that will send a certain user a notice via email that the certain thing that expires on that date is 1 month from expiring. So if today is 28-03-2012, that means that there is only 1 moonth before that thing expires.
  I didn't make any code for this because i don't know how to solve the -1 month. </p>