What PHP method is needed to automatically reply to add emoticons in WeChat public platform developer mode?

It is not possible to reply to "\ue048" with the interface file written by the Softbank version of emoji, such as the small icon of the snowman, "\ x0d \ \ x0d \ WeChat official account PHP. Transcoding is required, \ x0d \ \ x0d \/content \ x0d \ Unicode2UTF8 ("\ ue02d"); \x0d\\x0d\// transcoding function \ x0d \ functionUnicode2UTF8 ($ str) {//Unicode encoding conversion, used to display the emoji expression \ x0d \ $ str =' {"result _ str ":"'. $ str。 "}'; //combined into json format \ x0d \ $ strange = JSON _ decode ($ str, true); //json is converted into an array, and the escaped characters are restored to Unicode characters \ x0d \ return $ strangray ['result _ str'] by using json's support for \ uxxxxx; \x0d\}