向服务器提交POST表单并保存结果的原理，可做刷票系统。

         $str = " username=test&password=123 "
         $fp = fsockopen ( " www.123cha.com " , 80 );
         fputs ( $fp , " POST /postal/index.php HTTP/1.1 " );
         fputs ( $fp , " Host:www.123cha.com " );
         fputs ( $fp , " Content-Type:application/x-www-form-urlencoded " );
         fputs ( $fp , " Content-Length: " . strlen ( $str ) . " " );
         fputs ( $fp , $str . " " );
         while ( ! feof ( $fp ))
        {
                 $http_response .= fgets ( $fp , 128 );
        }
         fclose ( $fp );