title: PHP refresh, how can I stop the previous function being called again on page refresh?
body: <p>I have a function that imports a files contents into mySQL and returns the results. If i refresh the page and click "yes" it will do it again doubling the output with the same content. </p>
  
  <p>How can I stop this happening? In this particular case there is no URI in the address bar but on other functions there is.</p>