网页压缩传输文档
在编译php时，你只要加上 --with-zlib 就可以通过下面的函数压缩传输网页，对于较大的网页
效果比较明显 ：）
文件一 （此文件为压缩函数）
gzdoc.php
<?
ob_start();
ob_implicit_flush(0);
function GetHeader()
{
$headers = getallheaders();
while (list($header, $value) = each($headers))
{
$Message .= "$header: $value<br>\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('<br>','',GetHeader());
$Error_Msg .= "Time: ".date("Y-m-d H:i:s")."\n";
$Error_Msg .= "Remote-Address: ".$REMOTE_ADDR."\n";
//mail('[email protected]', "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<!-- Use compress $ENCODING -->\n";
$Contents = ob_get_contents();
ob_end_clean();
if ($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,0x08,0x00,0x00,0x00,0x00,0x00);
$Size = strlen($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('<br>','',GetHeader());
$Error_Msg .= "Time: ".date("Y-m-d H:i:s")."\n";
$Error_Msg .= "Remote-Address: ".$REMOTE_ADDR."\n";
//mail('[email protected]', "User can not use gzip output in file $PHP_SELF!!!", $Error_Msg);
exit;
}
}
?>
文件二 （此文件为范列）
<?
include("gzdoc.php");
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> 这是一个测试 </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<BODY BGCOLOR="#FFFFFF">
OK 啦！！！！呵呵。。。
</BODY>
</HTML>
<?
gzdocout();
?>
二 、把使用频繁的变量存入内存中
你在编译php时加上选项 --enable-sysvsem --enable-sysvshm 就可以实现了
下面是文件
文件一（函数文件）
mem_class.php
<?
class SharedMem{
var $SemaphoreID;
var $SharedMemID;
var $VarIndexes;
function SharedMem(){
$this->SemaphoreID = sem_get(1000,1,0600);
$this->SharedMemID = shm_attach(2000,65535,0600);
sem_acquire($this->SemaphoreID);
$this->VarIndexes = @shm_get_var($this->SharedMemID,0);
if(empty($this->VarIndexes)){
$this->VarIndexes = array();
shm_put_var($this->SharedMemID,0,$this->VarIndexes);
}
sem_release($this->SemaphoreID);
}
//取出存在共享内存中的某变量,返回false表示共享内存中无该变量
function read($name){
if(!isset($this->VarIndexes[$name])) return false;
$GLOBALS[$name] = shm_get_var($this->SharedMemID,$this->VarIndexes[$name]);
return true;
}
//将指定变量存入共享内存
function save($name){
if(!isset($this->VarIndexes[$name])){
$this->VarIndexes[$name] = count($this->VarIndexes)+1;
shm_put_var($this->SharedMemID,0,$this->VarIndexes);
}
shm_put_var($this->SharedMemID,$this->VarIndexes[$name],$GLOBALS[$name]);
}
}
?>
文件二 （exsample）
mem_test.php
<?
include("mem_class.php");
$test = new SharedMem();
$abc = '123';
$test->save('abc');
unset($abc);
$test->read('abc');
print $abc;
?>
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