I've this billing script. Where you can choose a customer, products, and make invoices. There are two submit buttons in the form. One to preview the invoice. Wich is sent as download in pdf format. The other one sends the invoice as an email attachment to the customer.

If yo try to send the invoice after previewing it dowloads the php file and sends the invoice twice. Its really strange. I don't know if its an php issue or an apache issue.

It's making me nuts.

I would be very happy if someone could give me some advice.

Could you show us the code? My guess is that the preview caches the pdf somewhere, and the actual submit caches it in the same place, so when it comes time to email it, it sends both attachments.

Show us the script.If there is a problem,it should definitely've a solution.