Phpmailer add PDF attachment from a link - php

Question

I'm using PHPMailer to send automatic email (obviously using PHP as programming language).
I would like to add a PDF attachment generated with TCPdf.
Unfortunately I cannot generate the PDF inside the php page where I'm using PHPMailer, and I cannot create a function that generate it.
I can only use a link to generate it, like this:
www.mypage.com/app-pdf/link_generate_pdf.php?IDToGenerate=131&PDFOutput=I
I was thinking that I can recall the page with the PDFOutput=S and "return" in some way the text of the PDF and add it as attachment.
Otherwise I can call the page with PDFOutput=F and save it to a temp folder and then attach it to the email.
The problem is that I don't know how to "call" a page as it were a function and return what the recalling page actually returns.
Do you have some suggestion?
Thank you
edit: I now understand the problem! The problem is that the URL is accessible only from autentication (login page). I thought that as I was logged in, the script was automatically capable of read the page. How can I solve this?

Answer 1

Use this to save the file on the server first and then attach
file_put_contents("Tmpfile.pdf", fopen("http://example.com/file.pdf", 'r'));
Attach as
$mail->AddAttachment('path_to_pdf/Tmpfile.pdf', $name = 'Name_of_pdf_file',
$encoding = 'base64', $type = 'application/pdf');
Hope this helps
Edit: Try this. works fine over here
file_put_contents("path_to_pdf/Tmpfile.pdf",
file_get_contents("http://example.com/file.pdf"));