setting VIPS_DISC_THRESHOLD

[ethaniel]

Can you please expand the documentation to let us configure VIPS_DISC_THRESHOLD?
Thank you.

[jcupitt]

Hi @ethaniel, it's in the main docs:

https://www.libvips.org/API/current/VipsImage.html#vips-image-new-from-file

But you're right that the PHP docs don't mention it directly.

I added a link to the main docs from the php docs, but a better solution would be a good idea.