Ok, I've got it!
Add this after #Company info
$message = wordwrap($giftcert["message"], 30, "\r \n");
Change the 30 to however many characters you want to wrap the text at.
And add this with the rest of the ImageTTFText statements
ImageTTFText($image, 10, 0, 190, 500, $black, $ttf_location,$message);
You'll need to mess with the layout a bit
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