title: PHP receive json
body: <p>I'm using knockout and this is my ajax code:</p>
  
  <pre><code>save: function() {
                  $.ajax({
                      url:"http://localhost/loyalty/welcome/json/",
                      type: "post",
                      data: ko.toJSON(this),
                      contentType: "application/json",
                      success: function (result) { alert(result) }
                  });
              }
  </code></pre>
  
  <p>Using firebug I can see that the json message is sent correctly, the problem is how to receive it on PHP, what is the name of what has been sent?</p>
  
  <p>I'm using CodeIgniter</p>
  
  <p>Thanks in advance for any help.</p>