void Test2(const std::wstring& wstrSource)
{
    wprintf(L"Test2: %sn", wstrSource.c_str());
}

I want to use wstring in SWIG in PHP but has problem including std_basic_string.i with syntax error in line 44 (SWIG 4.2.1) directory std:

%traits_swigtype(_CharT);

My example.i:

/* File : example.i */
%module example

%{
#include "example.h"
%}

%include std_wstring.i

%include "example.h"

I searched in Google and Stackoverflow but found no results. How could I fix this error?

SWIG help