PHP 異步處理類

該類可以請求HTTP和HTTPS協議，還可以處理301、302重定向以及GZIP壓縮等。

<?php
//使用方法
require('asynHandle.class.php');
$obj    = new asynHandle();

$result = $obj->Request('
<?php
/*
 * 異步處理類
 * @author lkk/lianq.net
 * @create on 10:05 2012-7-30
 * @example:
 *  $obj    = new asynHandle();
 *  $obj->Request('http://google.com');
 *  $obj->Get('http://google.com');
 */

class asynHandle {
    public      $url        = '';       //傳入的完整請求url,包括"http://"或"https://"
    public      $cookie     = array();  //傳入的cookie數組,須是鍵值對
    public      $post       = array();  //傳入的post數組,須是鍵值對
    public      $timeout    = 30;       //超時秒數
    public      $result     = '';       //獲取到的數據

    private     $gzip       = true;     //是否開啟gzip壓縮
    private     $fop        = NULL;     //fsockopen資源句柄
    private     $host       = '';       //主機
    private     $port       = '';       //端口
    private     $referer    = '';       //偽造來路
    private     $requestUri = '';       //實際請求uri
    private     $header     = '';       //頭信息

    private     $block      = 1;        //網絡流狀態.1為阻塞,0為非阻塞
    private     $limit      = 128;      //讀取的最大字節數  

    //構造函數
    public function __construct(){
        ignore_user_abort(TRUE);//忽略用戶中斷.如果客戶端斷開連接,不會引起腳本abort
        //set_time_limit(0);//取消腳本執行延時上限
    }

    //解析URL并創建資源句柄
    private function analyzeUrl(){
        if ($this->url == ''){return false;}
        $url_array = parse_url($this->url);
        !isset($url_array['host']) && $url_array['host'] = '';     
        !isset($url_array['path']) && $url_array['path'] = '';     
        !isset($url_array['query']) && $url_array['query'] = '';     
        !isset($url_array['port']) && $url_array['port'] = 80;

        $this->host          = $url_array['host'];
        $this->port          = $url_array['port'];
        $this->referer       = $url_array['scheme'].'://'.$this->host.'/';
        $this->requestUri    = $url_array['path'] ? 
                            $url_array['path'].($url_array['query'] ? '?'.$url_array['query'] : '') : '/';

        switch($url_array['scheme']){
            case 'https':
                $this->fop   = fsockopen('ssl://'.$this->host, 443, $errno, $errstr, $this->timeout);
                break;
            default:
                $this->fop   = fsockopen($this->host, $this->port, $errno, $errstr, $this->timeout);
                break;
        }

        if(!$this->fop){
            $this->result    = "$errstr ($errno)<br />\n";
            return false;
        }
        return true;
    }//analyzeUrl end

    //拼裝HTTP的header
    private function assHeader(){
        $method = empty($this->post) ? 'GET' : 'POST';
        $gzip = $this->gzip ? 'gzip, ' : '';

        //cookie數據
        if(!empty($htis->cookie)){
            $htis->cookie = http_build_cookie($htis->cookie);
        }

        //post數據
        if(!empty($this->post)){         
            $this->post = http_build_query($this->post);
        }

        $header = "$method $this->requestUri HTTP/1.0\r\n";
        $header .= "Accept: */*\r\n";
        $header .= "Referer: $this->referer\r\n";
        $header .= "Accept-Language: zh-cn\r\n";
        if(!empty($this->post)){
            $header .= "Content-Type: application/x-www-form-urlencoded\r\n";
        }
        $header .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
        $header .= "Host: $this->host\r\n";
        if(!empty($this->post)){
            $header .= 'Content-Length: '.strlen($this->post)."\r\n";
        }
        $header .= "Connection: Close\r\n";
        $header .= "Accept-Encoding: {$gzip}deflate\r\n";
        $header .= "Cookie: $this->cookie\r\n\r\n";
        $header .= $this->post;
        $this->header    = $header;
    }//assHeader end

    //返回狀態檢測,301、302重定向處理
    private function checkRecvHeader($header){
        if(strstr($header,' 301 ') || strstr($header,' 302 ')){//重定向處理
            preg_match("/Location:(.*?)$/im",$header,$match);
            $url = trim($match[1]);
            preg_match("/Set-Cookie:(.*?)$/im",$header,$match);
            $cookie = (empty($match)) ? '' : $match[1];

            $obj            = new asynHandle();
            $result         = $obj->Get($url, $cookie, $this->post);
            $this->result    = $result;
            return $result;
        }elseif(!strstr($header,' 200 ')){
            //找不到域名或網址
            return false;
        }else return 200;
    }//checkRecvHeader end

    //gzip解壓
    private function gzdecode($data){
        $flags = ord(substr($data, 3, 1));
        $headerlen = 10;
        $extralen = 0;
        $filenamelen = 0;
        if ($flags & 4) {
            $extralen = unpack('v' ,substr($data, 10, 2));
            $extralen = $extralen[1];
            $headerlen += 2 + $extralen;
        }
        if ($flags & 8) $headerlen = strpos($data, chr(0), $headerlen) + 1;
        if ($flags & 16) $headerlen = strpos($data, chr(0), $headerlen) + 1;
        if ($flags & 2) $headerlen += 2;
        $unpacked = @gzinflate(substr($data, $headerlen));
        if ($unpacked === FALSE) $unpacked = $data;
        return $unpacked;
    }//gzdecode end

    //請求函數,只請求,不返回
    public function Request($url, $cookie=array(), $post=array(), $timeout=3){
        $this->url       = $url;
        $this->cookie    = $cookie;
        $this->post      = $post;
        $this->timeout   = $timeout;

        if(!$this->analyzeUrl()){
            return $this->result;
        }
        $this->assHeader();

        stream_set_blocking($this->fop, 0);//非阻塞,無須等待
        fwrite($this->fop, $this->header);
        fclose($this->fop);
        return true;
    }//Request end

    //獲取函數,請求并返回
    public function Get($url, $cookie=array(), $post=array(), $timeout=30){
        $this->url       = $url;
        $this->cookie    = $cookie;
        $this->post      = $post;
        $this->timeout   = $timeout;

        if(!$this->analyzeUrl()){
            return $this->result;
        }
        $this->assHeader();

        stream_set_blocking($this->fop, $this->block);   
        stream_set_timeout($this->fop, $this->timeout);
        fwrite($this->fop, $this->header);
        $status = stream_get_meta_data($this->fop);

        if(!$status['timed_out']){
            $h='';
            while(!feof($this->fop)){
                if(($header = @fgets($this->fop)) && ($header == "\r\n" ||  $header == "\n")){
                    break;
                }
                $h .= $header;
            }
            $checkHttp  = $this->checkRecvHeader($h);
            if($checkHttp!=200){return $checkHttp;}

            $stop = false;
            $return = '';
            $this->gzip = false;
            if(strstr($h,'gzip')) $this->gzip = true;
            while(!($stop && $status['timed_out'] && feof($this->fop))){
                if($status['timed_out']) return false;
                $data = fread($this->fop, ($this->limit == 0 || $this->limit > 128 ? 128 : $this->limit));  
                if($data == ''){//有些服務器不行,須自行判斷FOEF
                    break;
                }
                $return .= $data;
                if($this->limit){
                    $this->limit -= strlen($data);
                    $stop = $this->limit <= 0;
                }

            }
            @fclose($this->fop);
            $this->result    = $this->gzip ? $this->gzdecode($return) : $return;
            return $this->result;
        }else{
            return false;
        }
    }//Get end


}