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blocking the posted data from outside of my domains

BR asked
Last Modified: 2017-04-19
I use php,
I have a web page that I should not allow anybody posting data to my website except one specific web site.
How can I block all the posts coming from outside except one domain?

I want to allow a website to post my page an input but I need to block the rest of the world.

by the way, only the registered users can post  data to my page, however I need to be sure that the data posted to my website must come from that specific domain.

How can I do that?
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