PHP异步调用socket

<?
$host = "www.aaa.com";
$path = "/Report.php?ReportID=1";
$cookie = Session_id();

$fp = fsockopen($host, 80, $errno, $errstr, 30);
if (!$fp) {
print "$errstr ($errno)<br />\n";
exit;
}
$out = "GET ".$path." HTTP/1.1\r\n";
$out .= "Host: ".$host."\r\n";
$out .= "Connection: Close\r\n";
$out .= "Cookie: ".$cookie."\r\n\r\n";

fwrite($fp, $out);  //将请求写入socket
//也可以选择获取server端的响应
/*while (!feof($fp)) {
echo fgets($fp, 128);
}*/
//如果不等待server端响应直接关闭socket即可
fclose($fp);
?>