title: Automatically execute a PHP script
body: <p>I am currently developing a website. Users can post ads which are added in a database.
  I would like to delete these ads when they are more than 60 days old.
  To do so, I will write a PHP script which will find such ads and delete them from the database.</p>
  
  <p>Right, it's easy. But how do I execute this script without loading a page every day in my browser ? How do I ask to my server to execute it automatically regularly ?</p>
  
  <p>Thanks !</p>
  
  <p>PS : I am on a shared server, not a dedicated one. Does it make cron use not possible ?</p>