php如何解码包含像\ u0003c这样的字符的文本文件？

When I run

$result = exec("curl someURL");

I got results that contains \u0003 etc.. chars:

"d":"\u003c?xml version=\"1.0\"?\u003e\u003cArrayOfAnnoncePresentation xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\"\u003e\u003cPageCount\u003e\u003cPageCount\u003e25\u003c/PageCount\u003e\u003c/PageCount\u003e\u003cAnnoncePresentation\u003e\u003cTitre\u003e3garages\u003c/Titre\u003e\u003cLienDetail\u003e/

How can I decode that ?