Description
1, the server caches the compressed files, re-accesses reduce the re-compression time, reduce CPU utilization.
2, by setting the client file cache time, reduce the number of re-requests, can be reduced by more than 85%.
3, image because it is already compressed format, just set the client cache time, do not do compression processing.
How to use:
1, the server must support the Gzip,rewrite feature.
2, add the following code to the "Rewritebase/" line of the. htacess file, as shown in figure
Rewriterule (. *.css$|. *.js$|. *.jpg$|. *.gif$|. *.png$) gzip.php?$1 [L]
3, upload gzip.php to root directory
4, the cache folder is built in the root directory, guaranteed to read and write.
Copy CodeThe code is as follows:
/**
* @author Seraphim
* @copyright 2012
*/
//
function Sendheader ($last _modified, $p _type, $content _length = 0)
{
Set the client cache validity time
Header ("Expires:".) Gmdate ("D, D M Y h:i:s", Time () + 15360000). "GMT");
Header ("cache-control:max-age=315360000");
Header ("Pragma:");
Set Last Modified Time
Header ("last-modified:".) $last _modified);
Set File type information
Header ($p _type);
Header ("Content-length:".) $content _length);
}
Define (' Abspath ', DirName (__file__). '/');
$cache = true;
$cachedir = ' cache/'; directory where GZ files are stored, ensuring writable
if (Empty ($_server[' query_string '))
Exit ();
$gzip = strstr ($_server[' http_accept_encoding '), ' gzip ');
if (empty ($gzip))
$cache = false;
$key = Array_shift (Explode ('? ', $_server[' query_string '));
$key = Str_replace ('.. /', ', $key);
$filename = Abspath. $key;
$symbol = ' _ ';
$rel _path = Str_replace (Abspath, ", DirName ($filename));
$namespace = Str_replace ('/', $symbol, $rel _path);
$cache _filename = Abspath. $cachedir. $namespace. $symbol. BaseName ($filename).
'. Gz '; Generate GZ file path
$ext = Array_pop (Explode ('. ', $filename)); Determine file type information by suffix
$type = "content-type:text/html"; The default file type
Switch ($ext)
{
Case ' CSS ':
$type = "Content-type:text/css";
Break
Case ' JS ':
$type = "Content-type:text/javascript";
Break
Case ' gif ':
$cache = false;
$type = "Content-type:image/gif";
Break
Case ' jpg ':
$cache = false;
$type = "Content-type:image/jpeg";
Break
Case ' PNG ':
$cache = false;
$type = "Content-type:image/png";
Break
Default
Exit ();
}
if ($cache)
{
if (file_exists ($cache _filename))
{//If there is a GZ file
$mtime = Filemtime ($cache _filename);
$gmt _mtime = gmdate (' d, D M Y h:i:s ', $mtime). ' GMT ';
if (Isset ($_server[' http_if_modified_since ') && array_shift (Explode ('; ', $_server[' http_if_modified_ SINCE ']) = =
$GMT _mtime))
{
Same as the file modification date in the browser cache, returns 304
Header ("http/1.1 304 not Modified");
Send Client Header
Header ("Content-encoding:gzip");
Sendheader ($gmt _mtime, $type);
}
Else
{
Read GZ file output
$content = file_get_contents ($cache _filename);
Send Client Header
Sendheader ($gmt _mtime, $type, strlen ($content));
Header ("Content-encoding:gzip");
Send data
Echo $content;
}
}
Else
if (file_exists ($filename))
{//does not have a corresponding GZ file
$mtime = Mktime ();
$gmt _mtime = gmdate (' d, D M Y h:i:s ', $mtime). ' GMT ';
Read file
$content = file_get_contents ($filename);
Remove the blank part
$content = LTrim ($content);
Compress file Contents
$content = Gzencode ($content, 9, $gzip? Force_gzip:force_deflate);
Send Client Header
Sendheader ($gmt _mtime, $type, strlen ($content));
Header ("Content-encoding:gzip");
Send data
Echo $content;
Write file
File_put_contents ($cache _filename, $content);
}
Else
{
Header ("http/1.0 404 Not Found");
}
}
Else
{//processing does not use the output in gzip mode. The principle of basic ibid.
if (file_exists ($filename))
{
$mtime = Filemtime ($filename);
$gmt _mtime = gmdate (' d, D M Y h:i:s ', $mtime). ' GMT ';
if (Isset ($_server[' http_if_modified_since ') && array_shift (Explode ('; ', $_server[' http_if_modified_ SINCE ']) = =
$GMT _mtime))
{
Same as the file modification date in the browser cache, returns 304
Header ("http/1.1 304 not Modified");
Send Client Header
Sendheader ($gmt _mtime, $type, strlen ($content));
Header ("Content-encoding:gzip");
}
Else
{
Read file output
$content = file_get_contents ($filename);
Send Client Header
Sendheader ($gmt _mtime, $type, strlen ($content));
Send data
Echo $content;
}
}
Else
{
Header ("http/1.0 404 Not Found");
}
}
?>
http://www.bkjia.com/PHPjc/325405.html www.bkjia.com true http://www.bkjia.com/PHPjc/325405.html techarticle Description: 1, the server caches the compressed files, re-accesses reduce the re-compression time, reduce CPU utilization. 2, reduce the number of requests by setting the client file cache time ...
