Why my php file return html file instaed of pdf data

[YT_Xaos]

I believe this is the answer to your question.

Are PDF files banned

I just checked the ticket correspondence and the statement in there seems quite clear: ALL PDFS are not allowed on free hosting anymore. Which tells me that 1) PDFs are indeed blanket banned and 2) this is probably a fairly new rule. I didn’t know that this was the case. Although I have seem quite a few bad sites using PDFs to do nasty stuff. And I can imagine PDF inspection isn’t easy enough that scanning the contents of PDFs is feasible.