PHP - Blocking of uploaded adult images

Question

We have a setup a product management system where the head of the product development can upload pictures of products and those pictures will instantly show up on our websit

Answer 1

Implement image premoderation. If there's a single person uploading those (like you imply), shouldn't be too hard for someone else to take a brief look and click "Approve" on each.

And it's way cheaper, and more reliable, than using any library. You cannot formalize "adult".