### 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 '<?' tag
.
** ------------Start of file----------
** |<?
** | include('gzdoc.php');
** | print "Start output !!";
** |?>
** |<HTML>
** |... the page ...
** |</HTML>
** |<?
** | gzdocout();
** |?>
** -------------End of file-----------
***************************************/
ob_start();
ob_implicit_flush(0);
function GetHeader(){
$headers = getallheaders();
while (list($header, $value) = each($headers)) {
$Message .= "$header: $value<br> ";
}
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('<br>','',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 " <!-- Use compress $ENCODING --> ";
$Contents = ob_get_contents();
ob_end_clean();
if ($CatocGz == 'Y'){
print "Not compress lenth: ".strlen($Contents)
."<BR>";
print "Compressed lenth: ".strlen(gzcompress($
Contents))."<BR>";
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('<br>','',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;
}
}
?>