title: Writing to CSV file in AS3
body: <p>I have looked far and wide but I can't find any resources on how to write to CSV files from flash AS3. 
  I know that flash cannot write to it alone. I have used PHP before to write to a txt file but now I need to open a csv and insert/edit entries that are already in it.</p>
  
  <p>How can I do this?</p>