php采集代码-反防盗链采集

function retrieveURLContentBySocket($url,
                                    $host="",
                                    $port=80,
                                    $timeout=30){
    if($host == ""){
        if(!($pos = strpos($url,'://'))){
            return false;
        }
        $host = substr( $url,
                        $pos+3,
                        strpos($url,'/',$pos+3) - $pos - 3);
        $uri = substr($url,strpos($url,'/',$pos+3));
    }
    else{
        $uri = $url;
    }

    $request =  "GET ".$uri." HTTP/1.0rn"
               ."Host: ".$host."rn"
               ."Accept: */*rn"
               ."User-Agent: ZealGetrn"
               ."rn";
    $sHnd = @fsockopen ($host, $port, $errno, $errstr, $timeout);
    if(!$sHnd){
        return false;
    }

    @fputs ($sHnd, $request);

    // Get source
    $result = "";
    while (!feof($sHnd)){
        $result .= fgets($sHnd,4096);
    }
    fclose($sHnd);

    $headerend = strpos($result,"rnrn");
    if (is_bool($headerend))
    {
        return $result;
    }
    else{
        return substr($result,$headerend+4);
    }