How can i get Json data in php which pass through ajax function

How can i get Json data in php which pass through ajax function

Hi,
I have a ajax function like below, which will send a json data to php file, How can i get these data in php file ?


            $.ajax({
                type: 'POST',
                url: 'data11.php',
                data: { json: ko.toJSON(viewModel) },
               
                    
                success: function () {
                  
                   
                }

            });

My Json data is something like below

  1. {"participants":[{" NoPrticiField":1,"empname":"gfh","designation":"fh","email":"fgh"},{"NoPrticiField":2,"empname":"fgh","designation":"fgh","email":"fgh"}]}: