Post to facebook group - alternative to using publish_to_group

I need a solution that will automate a post to my own managed facebook group.
I have a php script that creates the post ready to be sent to the group.
My post will contain text and images.
I had a previous system that used an fb app using publish_ to_group that I believe is no longer supported.
I need a replacement solution.  I am not sure if there is?  Happy to use any technology (not just FB app) that may achieve the same result.
Please do not bid unless you fully understand the issue and can suggest an alternative.
I will not pay for 'learning on the job' so please ensure you know the solution and can implement it within your quote before bidding.