php程序内部post数据的方法

$postdata = array();
$postdata['data1'] = "testdata1";
$postdata['data2'] = "testdata2";
$postdata['data3'] = "testdata3";
$url='http://yourdomain/do.php';
$str="";
foreach ($postdata as $k=>$v)
{
  $str.= "$k=".urlencode($v)."&";
}
$postdata=substr($str,0,-1);
$c = curl_init();
curl_setopt($c, curlopt_post, 1);
curl_setopt($c, curlopt_header, 0);
curl_setopt($c, curlopt_url,$url);
curl_setopt($c, curlopt_postfields, $postdata);
$result = curl_exec($c);