php enables gzip compression to accelerate website

php, gzip

Description:

The compressed files are cached on the server, which reduces re-compression time and CPU usage when accessed again. By setting the client file cache time and reducing the number of re-requests, it can be reduced by more than 85%. Because the image is already in a compressed format, only the client cache time is set and no compression is performed.

How to use:

The server must support gzip and Rewrite functions. Add the following code RewriteRule (..css$|..js$|..jpg$|..gif$|.*.png$) gzip.php in the line below "RewriteBase /" in the .htacess file ?$1 Upload gzip.php to the root directory

4. Create a cache folder in the root directory to ensure it is readable and writable.

/**
* @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 the last modification time
 header("Last-Modified: " . $last_modified);
 // Set the file type information
 header ($p_type);
 header("Content-Length: " . $content_length);
}
define('ABSPATH', dirname(__file__) . '/');
$cache = true;
$cachedir = 'cache /'; //The directory where gz files are stored must be writable
if (empty($_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)); //Judge file type information based on suffix
$type = "Content-type: text/html"; //Default file type
switch ($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 a gz file exists
 $mtime = filemtime($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'])) ==
 $gmt_mtime))
 {
 // with files in browser cache The modification date is consistent and 304 is returned. header("HTTP/1.1 304 Not Modified");
 // Send client header
 header("Content-Encoding:gzip");
 sendheader($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))
 { // There is no corresponding gz file
 $mtime = mktime();
 $gmt_mtime = gmdate('D, d M Y H:i:s', $mtime) . ' GMT';
 // Read the file
 $content = file_get_contents($filename);
 // Remove the blank part
 // $content = ltrim($content);
 // Compress file content
 $content = gzencode($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, $content);
 }
 else
 {
 header("HTTP/1.0 404 Not Found");
 }
}
else
{ // Process output in Gzip mode. The principle is basically the same as above
 if (file_exists($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'])) ==
 $gmt_mtime))
 {
 // with files in browser cache The modification date is consistent and 304 is returned. header("HTTP/1.1 304 Not Modified");
 // Send client header
 sendheader($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");
 }
}
?>