标 题: 使用php4加速网络传输。

/***************************************
** Title.........: PHP4 HTTP Compression Speeds up the Web
** Version.......: 1.10
** Author........: catoc <catoc@163.net>
** Filename......: gzdoc.php
** Last changed..: 25/08/2000
** Requirments...: PHP4 >= 4.0.1
**                 PHP was configured with --with-zlib[=DIR]
** Notes.........: Dynamic Content Acceleration compresses
**                 the data transmission data on the fly
**                 code by sun jin hu (catoc) <catoc@163.net>
**                 Most newer browsers since 1998/1999 have
**                 been equipped to support the HTTP 1.1
**                 standard known as "content-encoding."
**                 Essentially the browser indicates to the
**                 server that it can accept "content encoding"
**                 and if the server is capable it will then
**                 compress the data and transmit it. The
**                 browser decompresses it and then renders
**                 the page.
** Useage........:
**                 No space before the beginning of the first '.
**                 ------------Start of file----------
**                 |**                 | include('gzdoc.php');
**                 | print "Start output !!";
**                 |?>
**                 |
**                 |... the page ...
**                 |
**                 |**                 | gzdocout();
**                 |?>
**                 -------------End of file-----------
***************************************/
ob_start();
ob_implicit_flush(0);
function GetHeader(){
        $headers = getallheaders();
        while (list($header, $value) = each($headers)) {
                $Message .= "$header: $value
";
        }
        return $Message;
}
function CheckCanGzip(){
        global $HTTP_ACCEPT_ENCODING, $PHP_SELF, $Wget, $REMOTE_ADDR, 
$S_UserName;
        if (connection_timeout() || connection_aborted()){
                return 0;
        }
        if ((strpos('catoc'.$HTTP_ACCEPT_ENCODING, 'gzip')) || $Wget =
= 'Y'){
                if (strpos('catoc'.$HTTP_ACCEPT_ENCODING, 'x-gzip')){

                        $ENCODING = "x-gzip";
                        $Error_Msg = str_replace('
','',GetHeader()
);
                        $Error_Msg .= "Time: ".date("Y-m-d H:i:s")."
";
                        $Error_Msg .= "Remote-Address: ".$REMOTE_ADDR.
" ";
                        //mail('your@none.net', "User have x-gzip outp
ut in file $PHP_SELF!!!", $Error_Msg);
                }else{
                        $ENCODING = "gzip";
                }
                return $ENCODING;
        }else{
                return 0;
        }
}
function GzDocOut(){
        global $PHP_SELF, $CatocGz, $REMOTE_ADDR, $S_UserName;
        $ENCODING = CheckCanGzip();
        if ($ENCODING){
                print " ";
                $Contents = ob_get_contents();
                ob_end_clean();
                if ($CatocGz == 'Y'){
                        print "Not compress lenth: ".strlen($Contents)
."
";
                        print "Compressed lenth: ".strlen(gzcompress($
Contents))."
";
                        exit;
                }else{
                        header("Content-Encoding: $ENCODING");
                }
                print pack('cccccccc',0x1f,0x8b,0x08,0x00,0x00,0x00,0x
00,0x00);
                $Size = strlen($Contents);
                $Crc = crc32($Contents);
                $Contents = gzcompress($Contents);
                $Contents = substr($Contents, 0, strlen($Contents) - 4
);
                print $Contents;
                print pack('V',$Crc);
                print pack('V',$Size);
                exit;
        }else{
                ob_end_flush();
                $Error_Msg = str_replace('
','',GetHeader());
                $Error_Msg .= "Time: ".date("Y-m-d H:i:s")." ";
                $Error_Msg .= "Remote-Address: ".$REMOTE_ADDR." ";
                //mail('your@none.net', "User can not use gzip output 
in file $PHP_SELF!!!", $Error_Msg);
                exit;
        }
}
?>