使用php4加速web传输_PHP

/***************************************

** Title.........: PHP4 HTTP Compression Speeds up the Web

** Version.......: 1.10

** Author........: catoc

** 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)

** 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 !!";

** |?>

** |

** |... 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
\n";

}

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")."\n";

$Error_Msg .= "Remote-Address: ".$REMOTE_ADDR."\n";

//mail('[e-mail]', "User have x-gzip output 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 "\n\n";

$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,0x08,0x00,0x00,0x00,0x00,0x00);

$Size = strlen($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")."\n";

$Error_Msg .= "Remote-Address: ".$REMOTE_ADDR."\n";

//mail('[e-mail]', "User can not use gzip output in file $PHP_SELF!!!", $Error_Msg);

exit;

}

}

?>