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Этот маленький файл может удивительно много. Объединяет многочисленные таблицы стилей в один файл CSS. Так же поступает с множеством скриптов Javascript. Сжимает полученные файлы. Объединяет два файла в один архив GZIP, который легко и на лету распаковывают все современные браузеры. Прописывает .htaccess, инструктирующий браузеры кэшировать вышеназванный архив.

Выигрыш в скорости загрузки получается, прямо скажем, заметный. И все это делает скрипт compress.php. Его код мы приводим ниже:

<?php
/*
*
* Name: compress.php
*
* Purpose:
* Allow Apache server to directly serve pre-gzipped and minified JS and CSS files
* with no server overhead for deflating or gzipping the file each time it is served.
* This script combines, minifies and gzips Javascript and Cascading Style Sheet files
* in batch mode. Each combined group of JS or CSS creates two files:
* Minified; Minified and Gzipped; base file names set by user
*
* Reason for using:
* You want to reduce server overhead by eliminating server calls and decreasing the number
* of bytes transmitted.
* You are serving move than one JS or CSS file per page.
* Your JS and CSS are not minified and/or not GZipped
* Your Host server does not support or implement mod_pagespeed
* Your Host server does not support/implement by default gzip or deflate for js or css files
* Online minify packages have performance issues on your server and increase server overhead
*
* Features:
* Source files unchanged, output written to user specified directory reserved
* for compressed/minified files
* Appends time stamp to user file names avoiding cache issues when file data changes.
* Creates a PHP file that provides the timestamp for the created files
* so user written PHP code can easily generate correct html links.
* Creates output directory and .htaccess file on initial execution
* allowing Apache to correctly serve gzipped JS and CSS files
* and cache the combined files for one week
* Deletes outdated versions of combined files
*
* Usage:
* Install module in www/dir where dir is a directory of your choice
* PHP file compress_timestamp.php is written to this directory
* directory can be at any level
* Install CSSMIN into www/dir and optionally change settings
* Install JSMIN into www/dir and optionally change settings
* Set output directory name, default: ../min
* should be at the same level as your CSS directory or background-url may need to change
* code the combining output file names and source file names
* execute the script (initial)
* Change your source code to use generated files, sample shown below
* execute the script when changes are made to the source CSS or JS files
* (optional) setup Cron job on your host to run weekly catching changes
* that may not have been compressed
*
* Sample PHP implementation code:
*
* require_once('compress_timestamp.php'); //load timestamp created by compress.php module
* //sets field $compress_stamp=unix_timestamp
* if (stripos($_SERVER['HTTP_ACCEPT_ENCODING'],'GZIP')!==false)
* $gz='gz';
* else
* $gz=null;
* echo '<link rel="stylesheet" type="text/css" href="min/css_schedule_'.$compress_stamp.'.css'.$gz.'" />',PHP_EOL;
*
* // the following scripts were combined into two groups named css_schedule and css_non_schedule
* // echo '<link rel="stylesheet" type="text/css" href="CSS/menu.css" />',PHP_EOL;
* // echo '<link rel="stylesheet" type="text/css" href="CSS/ThreeColumnFixed.css" />',PHP_EOL;
* // echo '<link rel="stylesheet" type="text/css" href="CSS/sprite.css" />',PHP_EOL;
* // echo '<link rel="stylesheet" type="text/css" href="CSS/iCal.css" />',PHP_EOL;
*
* PHP 5 or higher is required.
*
* Copyright (c) 2011 Arnold Burkhoff
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* --
*
* @package compress.php
* @author Arnold Burkhoff <arnbme@gmail.com>
* @license http://opensource.org/licenses/mit-license.php MIT License
* @version 1.0.1 (2011-02-06)
* @link http://code.google.com/p/compress
* @dependencies:
* JSMin author Ryan Grove <ryan@wonko.com> https://github.com/rgrove/jsmin-php/
* PHP version of Douglas Crockford's JSMin
* copyright 2002 Douglas Crockford <douglas@crockford.c
* copyright 2008 Ryan Grove <ryan@wonko.com> (PHP port)
*
* CSSMin author Joe Scyllia http://code.google.com/p/cssmin/
* copyright 2008 - 2011 Joe Scylla <joe.scylla@gmail.com>*
*/

$unix_timestamp = time(); //get unix time stamp added to all file names
$adir = "../min"; //directory to store output, must not be one of the source directories
require_once('jsmin.php'); //load javascript minifier
require_once('cssmin.php'); //load css minifier

// Create target directory and write Apache htaccess file when no directory found
if (!file_exists($adir))
{
mkdir($adir) && chmod($adir, 0777);
$htaccess='Options All -Indexes'.PHP_EOL;
$htaccess.='AddType text/css cssgz'.PHP_EOL;
$htaccess.='AddType text/javascript jsgz'.PHP_EOL;
$htaccess.='AddEncoding x-gzip .cssgz .jsgz'.PHP_EOL;
$htaccess.='# for all files in min directory'.PHP_EOL;
$htaccess.='FileETag None'.PHP_EOL;
$htaccess.='# Cache for a week, attempt to always use local copy'.PHP_EOL;
$htaccess.='<IfModule mod_expires.c>'.PHP_EOL;
$htaccess.=' ExpiresActive On'.PHP_EOL;
$htaccess.=' ExpiresDefault A604800'.PHP_EOL;
$htaccess.='</IfModule>'.PHP_EOL;
$htaccess.='<IfModule mod_headers.c>'.PHP_EOL;
$htaccess.=' Header unset ETag'.PHP_EOL;
$htaccess.=' Header set Cache-Control "max-age=604800, public"'.PHP_EOL;
$htaccess.='</IfModule>'.PHP_EOL;
file_put_contents($adir.'/.htaccess',$htaccess); //write initial htaccess file
}

// prepare combined, minfied and combined, minified and gzipped css and js files
file_compress('css_schedule.css',array('../CSS/menu.css','../CSS/ThreeColumnFixed.css','../CSS/sprite.css','../CSS/iCal.css'));
file_compress('css_non_schedule.css',array('../CSS/menu.css','../CSS/ThreeColumnFixed.css','../CSS/sprite.css'));
file_compress('css_schedule_ie7.css',array('../CSS/menuIE.css','../CSS/ThreeColumnFixed.css','../CSS/sprite.css','../CSS/iCal.css'));
file_compress('css_non_schedule_ie7.css',array('../CSS/menuIE.css','../CSS/ThreeColumnFixed.css','../CSS/sprite.css'));
file_compress('css_ie6.css',array('../CSS/menuIE6.css','../CSS/ThreeColumnFixedIE6.css','../CSS/sprite.css'));
file_compress('js_schedule.js',array('../JS/Schedule.js','../JS/iCal.js','../JS/Findit.js','../JS/UlScroll.js','../ExternalConnect/External.js'));
file_compress('js_non_schedule.js',array('../JS/Findit.js','../JS/UlScroll.js','../ExternalConnect/External.js'));

// write new timestamp file compress_timestamp.php for php execution code
$infofile='<?php'.PHP_EOL;
$infofile.='$compress_stamp='.$unix_timestamp.';'.PHP_EOL;
$infofile.='?>'.PHP_EOL;
file_put_contents ('compress_timestamp.php',$infofile,LOCK_EX); //file loaded by ThreeColTemplate1.php to get unique stamp id

// 5 second delay should take care of 99.9% of inflight requests
// except on super overloaded servers or slow connections
sleep(5);

// delete older files in library
$unix_timestamp.=''; //make a string
if (file_exists($adir) && $dh = opendir($adir))
{
while($fn = readdir($dh)) if ($fn[0] != ".")
{
if (strpos($fn,$unix_timestamp)===false)
{
unlink($adir.'/'.$fn);
echo $fn,' deleted<br>';
}
}
closedir($dh);
}
else
echo 'failed to open ',$adir,' ',date("r"),PHP_EOL;

function file_compress($file_name,$file_input) {
global $unix_timestamp,$adir;
$pos=strrpos($file_name,'.'); //get last . in file name
if ($pos==false)
die ('illogical response from strrpos');
$fn=substr($file_name,0,$pos).'_'.$unix_timestamp.substr($file_name,$pos); //put timestamp into file name
$fl=null; //clear file data variable
foreach($file_input as $value) //merge files in the group
$fl.= file_get_contents($value).' ';
$len_orig=strlen($fl);
if (strtolower(substr($file_name,$pos+1,2)) == 'js')
// $fl = preg_replace('/\t| {2,}/', '', $fl);
$fl = JSMin::minify($fl); //minify js
else
// $fl = preg_replace('/\n\r|\r\n|\n|\r|\t| {2,}/', '', $fl);
$fl = CssMin::minify($fl); //minify css

$len_minify=strlen($fl);
$gzdata=gzencode ($fl,9); //gzip

// write files no need to lock, filename is unique and not yet in use
file_put_contents ($adir.'/'.$fn,$fl); //put out minified, non gzipped version
file_put_contents ($adir.'/'.$fn.'gz',gzencode ($fl,9)); //put out gzipped version
echo $adir.'/'.$fn, ' created length: ', $len_minify, ' ', $len_orig,'<br />';
echo $adir.'/'.$fn.'gz', ' created length: ', strlen($gzdata), ' ', $len_minify, ' ', $len_orig,'<br />';
}
?>

Как видите, все просто, понятно, никаких скелетов в шкафу и пасхальных яиц. Что на витрине, то и в магазине.

Удачи вам! Опытом оптимизации фронт-энд поделилась с вами Веб-студия "АКРИТ". Разработка и продвижение сайтов на CMS «1С-Битрикс». Мы реализуем полный цикл работ - от разработки логотипа и фирменного стиля будущей компании, до ее продвижения на рынок, используя максимально эффективные современные технологии.

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