UTF-8 编码的 equal 问题

public plugin_init()
{
       register_clcmd("utf8", "cmdUtf8");
}

public cmdUtf8(id)
{
       if (read_argc() < 2)
              return PLUGIN_HANDLED;
       
       new szCmd[32];
       read_argv(0, szCmd, 31);
       new szArg[32];
       read_argv(1, szArg, 31);
       
       if (equal(szCmd, "utf8") && str_to_num(szArg) > 0)
       {
              new str1 = "中文";
       
              if (equal(szArg, str1)) {
                     client_print(id, print_chat, "%s is equal to %s", szArg, str1)
              } else {
                     client_print(id, print_chat, "%s is not equal to %s", szArg, str1)
              }
       }
       return PLUGIN_HANDLED;
}