At the time of this post, no.
PDFNet does not provide pre-built PHP bindings, due to the variety of different (incompatible) versions being used.
We do provide the full steps for customers to generate their own PHP bindings, using SWIG.
https://github.com/PDFTron/PDFNetWrappers
Unfortunately, at this time SWIG cannot generate PHP7 wrapper.
https://github.com/swig/swig/issues/571