title: Run PHP File On Button Click
body: <p>I wonder whether someone could help me please.</p>
  
  <p>I've been looking through this, and many other sites and tutorials to find out how to add a button to a form which opens a PHP file, in this case, a pop up form that allows a user to upload a file to a mySQL database.</p>
  
  <p>In addition to the opening of the file, I'd like to carry over the 'id' field value from the main form to the pop 'File Upload' form.</p>
  
  <p>From the research I've carried out there seems to be a number of ways to do this, but from a beginners perspective I'm not sure what is the best way to do this.</p>
  
  <p>Could someone perhaps please advise on what is the best way to go about this.</p>
  
  <p>Many thanks and kind regards</p>