php unicode编码如何通过c++给转化成汉字

#include<iOStream>
#include<sstream>
#include<codecvt>
#include<locale>
using namespace std;
int main()
{
    string unicode_str = "\\u4e2d\\u6587";
    std::stringstream ss;
    for (size_t i = 0; i < unicode_str.length(); i++)
    {
        if (unicode_str[i] == '\\')
        {
            if (i + 5 < unicode_str.length() && unicode_str[i + 1] == 'u')
            {
                unsigned short unicode_char;
                std::stringstream ss;
                ss << std::hex << unicode_str.substr(i + 2, 4);
                ss >> unicode_char;
                ss.clear();
                ss.str("");
                std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
                std::wstring utf16_str = converter.from_bytes((char*)&unicode_char, (char*)&unicode_char + 2);
                ss << utf16_str;
                i += 5;
            }
            else
                ss << unicode_str[i];
        }
        else
            ss << unicode_str[i];
    }
    std::wstring_convert<std::codecvt_utf8<wchar_t>> cvt;
    wstring converted = cvt.from_bytes(ss.str());
    wcout << converted << endl;
    return 0;
}