c++ php str_replace analog using std string

php_str_replace.cpp

std::wstring str_replace(std::wstring search, std::wstring replace, std::wstring subject)
{
	std::wstring result = subject;
	if (subject.length() == 1) {
		if (subject == search) return replace;
	}
	else if (subject.length() > 1) {
		std::string::size_type start_pos = 0;
		std::string::size_type search_length = search.length();
		std::string::size_type replace_length = replace.length();
		std::string::size_type found_pos = result.find(search, start_pos);
		while (std::string::npos != found_pos) {
			result = result.replace(found_pos, search_length, replace);
			start_pos = found_pos + replace_length;
			found_pos = result.find(search, start_pos);
		}
	}
	return result;
}