How do I auto-populate the text area below with two PHP variables, $submission and $fullurl?
<textarea>
s are given default values like so:
<textarea>value</textarea>
So use something like:
<textarea name="tweet" cols="50"rows="5" id="tweet"><?php echo $submission ?> <?php echo $fullurl ?></textarea>
Note that any whitespace is represented as-is in a textarea, so newlines will result in newlines in the textbox.