L'optimisation maximale... - Version imprimable

Code PHP :
<?php

/**

 *

 *    Web D20

 *    Copyright FOURNET Loïc - 2005/2008

 *

 */

require_once dirname( __file__ ) . '/_config.php';



if ( $_SERVER['HTTP_HOST'] == 'localhost' )

    define( '__ROOTPATH', 'http://localhost/anthor' );

else

    define( '__ROOTPATH', 'http://www.anthor.net' );



ob_start();



/**

 *    The mkdir function does not support the recursive parameter in some version of 

 *    PHP run by Web Hosting. This function simulates it.

 */



function mkdir_r( $dir_name, $rights = 0777 )

{

    $dirs = explode( "/", $dir_name );

    $dir = "";

    foreach ( $dirs as $part )

    {

        $dir .= $part . "/";

        if ( !is_dir($dir) && strlen($dir) > 0 )

            mkdir( $dir, $rights );

    }

}



/**

 *    Wich file are we asking ?

 */

$src_uri = str_replace( __ROOTPATH . '/gz-cache', '', 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );

$dirname = dirname( __file__ );



/**

 *    List of known content types based on file extension.

 *    Note: These must be built-in somewhere...

 *    Like finfo_file, to try

 */



$known_content_types = array( "htm" => "text/html", "html" => "text/html", "js" => "text/javascript", "css" =>

    "text/css", "xml" => "text/xml", "gif" => "image/gif", "jpg" => "image/jpeg", "jpeg" => "image/jpeg", "png" =>

    "image/png", "txt" => "text/plain" );



/**

 *    Verify the existence of the target file.

 *    Return HTTP 404 if needed.

 */



if ( !is_file($dirname . $src_uri) )

{

    header( "HTTP/1.1 404 Not Found" );

    echo ( "<html><body><h1>HTTP 404 - Not Found</h1></body></html>" );

    exit;

}



/**

 *    Set the HTTP response headers that will

 *    tell the client to cache the resource.

 */



$file_last_modified = filemtime( $dirname . $src_uri );

header( "Last-Modified: " . date("r", $file_last_modified) );



$max_age = 300 * 24 * 60 * 60; // 300 days



$expires = $file_last_modified + $max_age;

header( "Expires: " . date("r", $expires) );



$etag = dechex( $file_last_modified );

header( "ETag: " . $etag );



$cache_control = "must-revalidate, proxy-revalidate, max-age=" . $max_age . ", s-maxage=" . $max_age;

header( "Cache-Control: " . $cache_control );



/**

 *    Check if the client should use the cached version.

 *    Return HTTP 304 if needed.

 */



if ( function_exists("http_match_etag") && function_exists("http_match_modified") )

{

    if ( http_match_etag($etag) || http_match_modified($file_last_modified) )

    {

        header( "HTTP/1.1 304 Not Modified" );

        exit;

    }

}



/**

 *    Extract the directory, file name and file

 *    extension from the "uri" parameter.

 */



$uri_dir = "";

$file_name = "";

$content_type = "";



$uri_parts = explode( "/", $src_uri );



for ( $i = 0; $i < count($uri_parts) - 1; $i++ )

    $uri_dir .= $uri_parts[$i] . "/";



$file_name = end( $uri_parts );



$file_parts = explode( ".", $file_name );

if ( count($file_parts) > 1 )

{

    $file_extension = end( $file_parts );

    $content_type = $known_content_types[$file_extension];

}



/**

 *    Get the target file.

 *    If the browser accepts gzip encoding, the target file

 *    will be the gzipped version of the requested file.

 */



$dst_uri = $dirname . $src_uri;



$compress = true;



/**

 *    Let's compress only text files...

 */



$compress = $compress && ( strpos($content_type, "text") !== false );



/**

 *    Finally, see if the client sent us the correct Accept-encoding: header value...

 */



$compress = $compress && ( strpos($_SERVER["HTTP_ACCEPT_ENCODING"], "gzip") !== false );



if ( $compress )

{

    $gz_uri = $dirname . '/_cache/gzip' . $src_uri . '.gz';



    if ( file_exists($gz_uri) )

    {

        $src_last_modified = filemtime( $dirname . $src_uri );

        $dst_last_modified = filemtime( $gz_uri );



        /**

         *    The gzip version of the file exists, but it is older

         *    than the source file. We need to recreate it...

         */

        if ( $src_last_modified > $dst_last_modified )

            unlink( $gz_uri );

    }



    if ( !file_exists($gz_uri) )

    {

        if ( !file_exists($dirname . '/_cache/gzip' . $uri_dir) )

            mkdir_r( $dirname . '/_cache/gzip' . $uri_dir );



        $error = false;



        /**

         *    Output a gzipped minified javascript version of the input file

         */

        if ( strpos($content_type, "javascript") !== false )

        {

            require_once dirname( __file__ ) . '/_moteur/jsmin.php';



            if ( $fp_out = gzopen($gz_uri, "wb") )

            {

                if ( $data = file_get_contents($dirname . $src_uri) )

                {

                    gzwrite( $fp_out, JSMin::minify($data) );

                    gzclose( $fp_out );

                }

                else

                {

                    $error = true;

                }

            }

            else

            {

                $error = true;

            }

        }



        /**

         *    Output a gzipped minified css version of the input file

         */  elseif ( strpos($content_type, "css") !== false )

        {

            require_once dirname( __file__ ) . '/_moteur/cssmin.php';



            if ( $fp_out = gzopen($gz_uri, "wb") )

            {

                if ( $data = file_get_contents($dirname . $src_uri) )

                {

                    gzwrite( $fp_out, cssmin::minify($data) );

                    gzclose( $fp_out );

                }

                else

                {

                    $error = true;

                }

            }

            else

            {

                $error = true;

            }

        }



        /**

         *    Output a gzipped text version of the input file

         */

        else

        {

            if ( $fp_out = gzopen($gz_uri, "wb") )

            {

                if ( $data = file_get_contents($dirname . $src_uri) )

                {

                    gzwrite( $fp_out, $data );

                    gzclose( $fp_out );

                }

                else

                {

                    $error = true;

                }

            }

            else

            {

                $error = true;

            }

        }

        if ( !$error )

        {

            $dst_uri = $gz_uri;

            header( "Content-Encoding: gzip" );

        }

    }

    else

    {

        $dst_uri = $gz_uri;

        header( "Content-Encoding: gzip" );

    }

}

/**

 *    Output the target file and set the appropriate HTTP headers.

 */

if ( $content_type )

    header( "Content-Type: " . $content_type );



header( "Content-Length: " . filesize($dst_uri) );



readfile( $dst_uri );



ob_end_flush();

?>