php异步http请求

//因为是用fsockopen实现的所以需要自己写http请求
function getPostHeader($url,$data)
{
//    $URL='http://test.com/001/test.php';
    $URL = $url;
    $data_string = http_build_query($data);
    $referrer="";
// parsing the given URL
    $URL_Info=parse_url($URL);
// Building referrer
    if($referrer == "") // if not given use this script as referrer
        $referrer = 'http://test.com';
// Find out which port is needed - if not given use standard (=80)
    if(!isset($URL_Info["port"]))
        $URL_Info["port"]=80;
// building POST-request:
    $request = '';
    $request.="POST ".$URL_Info["path"]." HTTP/1.1\n";
    $request.="Host: ".$URL_Info["host"]."\n";
    $request.="Referer: $referrer\n";
    $request.="Content-type: application/x-www-form-urlencoded\n";
    $request.="Content-length: ".strlen($data_string)."\n";
    $request.="Connection: close\n";
    $request.="\n";
    $request.=$data_string."\n";
    return $request;
}

$fp = fsockopen($host, 80, $errno, $errstr, 30);
    if (!$fp) {
        echo "$errstr ($errno)
\n";
    } else {
        fwrite($fp, getPostHeader($url.'?'.$i,array('str'=>$strArr[$i])));
        /*忽略执行结果*/
//        while (!feof($fp)) {
//            echo fgets($fp, 128);
//        }
        sleep(1);
        fclose($fp);
    }

/**
 * Created by PhpStorm.
 * User: jin
 * Date: 2015/9/25
 * Time: 11:54
 */
class MysqlDb
{
    static $dbArr = array();
    private $conection = null;
    private $dsn = null;
    private $usernName = null;
    private $userPwd = null;
    private $parameter = null;
    function __construct($username,$pwd,$dbname,$host,$parameter = array())
    {
        $this->dsn='mysql:host='.$host.';dbname='.$dbname;
        $this->usernName = $username;
        $this->userPwd = $pwd;
        $this->parameter = $parameter;
        $this->connect();
    }
    private function connect()
    {
        //当初始化对象失败，也就是连接数据库失败时，会抛出PDOException异常
        try{
            //实例化对象
            $this->conection = new PDO($this->dsn,$this->usernName,$this->userPwd,$this->parameter);
            //设置编码
            $this->conection->exec('set names utf8');
            return true;
        }catch(PDOException $e){
            //结束程序,并打印错误信息
            error_log($e->getMessage(), 0);
            return $e->getMessage();
        }
    }
    //写入操作
    function excute($sql,$parameter = array())
    {
        try
        {
            $prepare = $this->conection->prepare($sql);
            $res = $prepare->execute($parameter);
        }
        catch(PDOException $e)
        {
            if($e->errorInfo[0] == 70100 || $e->errorInfo[0] == 2006){
                $count = 0;
                while(!$this->connect()){
                    sleep(1);
                    echo "数据库重新连接失败(try:{$count})\n";
                    $count++;
                };
                $res = $this->excute($sql, $parameter);
            }
            else
            {
                exit($e->errorInfo[2]);
            }
        }
        return $res;
    }
    //查询操作
    function query($sql,$parameter = array())
    {
        try
        {
            $prepare = $this->conection->prepare($sql);
            $prepare->execute($parameter);
            //设置返回的是索引数组
            $prepare->setFetchMode(PDO::FETCH_ASSOC);
            //取出结果数组
            $row = $prepare->fetchAll();
        }
        catch(PDOException $e)
        {
            if($e->errorInfo[0] == 70100 || $e->errorInfo[0] == 2006){
                $count = 0;
                while(!$this->connect()){
                    sleep(1);
                    echo "数据库重新连接失败(try:{$count})\n";
                    $count++;
                };
                $res = $this->query($sql, $parameter);
            }
            else
            {
                exit($e->errorInfo[2]);
            }
        }
        return $row;
    }
    //只查询第一条
    function find($sql,$parameter = array())
    {
        $row = $this->query($sql,$parameter);
        return current($row);
    }
    //关闭连接
    function close()
    {
        $this->conection = null;
    }
    function getLastInsertId()
    {
        return $this->conection->lastInsertId();
    }
}