php模拟POST提交数据

$params = array('uin=23445','hash=rty67uiop','timestamp='.time()); 
$params = implode('&',$params);           
$header = "POST /check.php HTTP/1.1\r\n"; 
$header .= "Host:tryit.com:80\r\n"; 
$header .= "Content-Type: application/x-www-form-urlencoded\r\n"; 
$header .= "Content-Length: " . strlen($params) . "\r\n"; 
$header .= "Connection: Close\r\n\r\n"; 
$header .= $params; 
$fp = fsockopen('tryit.com', 80); 
fputs($fp, $header); 
while (!feof($fp)) { 
      $getstr .= fgets($fp); 
}
echo $getstr;
fclose($fp);