Sending emoticons from iPhone to CakePHP but received blank value

Hello, everybody.

I am developing an iPhone app that would send emoticons from iPhone to server-side.

But, what the server-side received everytime is always null(or blank?).

I referred here at SO but with no help.
I also referred HTML_Emoji but it seems to be not an simple encoding or escape character issue.

Is it an issue about carrier's emoticons codes?

So, how could I receive the right emoticons in CakePHP?
Or its not an issue just in CakePHP framework but in PHP or Java or any language else?

What I am developing is the webservice(server-side), and the development of iPhone app is other partner.What sending from iPhone is no problem by theirs saying and with log output(such as \Ud83c\Udfe7) in Xcode when debugging, but I just receive them at server-side with blank value.

By the way, one message sending from our iPhone app with just plain text, it could be received correctly(received by $_POST in CakePHP);
with emoticons in the message, what php received is only plain text without emoticons in it.

Thanks.

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