php调用系统命令执行批处理文件

header("Content-Type: text/html; charset=gb2312");
function my_exec($cmd, $input='')
{
       $proc=proc_open($cmd, array(0=>array('pipe', 'r'),
                          1=>array('pipe', 'w'),
                          2=>array('pipe',  'w')),
                          $pipes);
      fwrite($pipes[0], $input); fclose($pipes[0]);
       $stdout=stream_get_contents($pipes[1]); fclose($pipes[1]);    
      $stderr=stream_get_contents($pipes[2]); fclose($pipes[2]);
       $rtn=proc_close($proc); return array( 'stdout'=>$stdout,
                                     'stderr'=>$stderr,
                                'return'=>$rtn );
}
      $need_run_file = __DIR__.'..\1\make.bat';
      $need_run_file = 'D:\xampp\htdocs\wu\1\make.bat';
      var_export(my_exec($need_run_file)); 
?>