title: Determine if empty $_POST submitted
body: <p>I have a form containing tabular data, with each row having a checkbox with the same name so that it gets passed via POST as an array to a PHP page. Everything work fine, but I have an issue relating to when none of the items on the page are selected - this is a special case that I need to handle in a specific way, but I am trying to figure out how to determine the best way to tell when this condition occurs, as when it does the <code>$_POST</code> array is completely empty.</p>
  
  <p>Any strategies to help in determining when an empty set of data has been POSTed to a page in PHP?</p>