php socket异步

/**
 * socket异步请求
 * @author mijunzhu 2015-01-14
 * @param string  $sHost  主机不带http:// 和 端口号
 * @param string  $sMethod  post / get
 * @param string  $sUrl   不带域名
 * @param array   $arData  数组
 * @param  int    $iPort  端口号
 * @param int     $iTimeout
 * @return bool
 */
function asyn_request($sHost,$sUrl,$arData, $sMethod='POST',$iPort=80, $iTimeout = 1)
{
    $fp = @fsockopen($sHost,$iPort,$errno,$errstr,$iTimeout);
    //错误
    if(!$fp){echo"$errstr ($errno)<br/>uuuuuuu\n";exit;}

    $qstr = http_build_query($arData);//请求参数
    $params = "";
    $params.= $sMethod == "GET" ? "GET {$sUrl}?{$qstr} HTTP/1.1\r\n" :  "POST {$sUrl} HTTP/1.1\r\n";
    $params.= "Host: ".$sHost."\r\n";
    $params.= "User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5\r\n";
    $params.= "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n";
    $params.= "Accept-Language: zh-cn,zh;q=0.5\r\n";
    $params.= "Accept-Encoding: gzip,deflate\r\n";
    $params.= "Accept-Charset: GB2312,utf-8;q=0.7,*;q=0.7\r\n";
    $params.= "Keep-Alive: 300\r\n";
    $params.= "Connection: keep-alive\r\n";
    $params.= "Content-Type: application/x-www-form-urlencoded\r\n";
    $params.= "Content-Length: ".strlen($qstr)."\r\n\r\n";
    $params.= $sMethod == "GET" ? null :$qstr;
    fwrite($fp, $params);
    fclose($fp);
}