PHP 启用Gzip 压缩进行优化

确定服务器支持gzip compression
Use PHP to Gzip CSS files  http://papermashup.com/use-php-to-gzip-css-files/
Compress CSS and JavaScript with PHP http://wp-mix.com/compress-gzip-deflate-css-javascript/
Enabling Gzip Compression of PHP, CSS, and JS Files Without mod_deflate
http://www.warpconduit.net/2010/10/23/enabling-gzip-compression-of-php-css-and-js-files-without-mod_deflate/
Minify helper for cakephp http://bakery.cakephp.org/articles/_k10_/2009/01/17/minify-helper-for-cakephp
Using PHP Minify in CakePHP http://7shifts.com/using-php-minify-in-cakephp/
这篇文章的问题：
1. $min_cachePath = TMP . '/minify';  这里要改为：$min_cachePath = TMP . 'minify';
2. 在app/tmp建立minify文件夹。
3. 修改函数：同时里面的e方法改成echo方法。

function _path($assets, $ext){
        if(!is_array($assets)){
            $assets = array($assets);
        }
        $path = $this->webroot . "min-" . $ext . "?f=";
        foreach($assets as $asset){
            if(strpos($asset,"/")===0){
                //如果以为/开头，表示这个文件不是在规定的地方里面，所以要特殊处理
                $path .= (substr($asset,1) . ".$ext,");
            }else{
                $path .= ($ext . '/' . $asset . ".$ext,");
            }

        }
        return substr($path, 0, count($path)-2);
    }

4.  这里两个变量不存在，要增加app/Vendor/min/config.php
$min_serveOptions['rewriteCssUris'] = false;
$min_serveOptions['minifierOptions']['text/css']['prependRelativePath'] = WEBROOT_URL . 'css/theme/';
5.清理缓存后第一次刷新没问题，第二次刷新就无法下载压缩后的文件，为何？
$path .= ($ext . '/' . $asset . ".$ext"."&rt=".rand(100000,999999)); 这个方法加上随机数，能解决这个问题，但是，客户端能否缓存？




Compress CSS and JavaScript with PHP
CSS, JavaScript131
Quick snippets for compressing CSS and JavaScript with PHP’s ob_gzhandler, which will gzip or deflate content depending on browser support.

Compress CSS content
To compress CSS content, add the following code to any PHP file (i.e., .php extension):

<?php // compress CSS
	header("content-type: text/css; charset: utf-8");
	header("cache-control: must-revalidate");
	$offset = 365 * 24 * 60 * 60;
	$expire = "expires: ".gmdate("D, d M Y H:i:s", time() + $offset)." GMT";
	header($expire);
	if(!ob_start("ob_gzhandler")) ob_start();
?>
 
<?php // replace this line with as much CSS code as you want ?>
 
<?php ob_flush(); ?>

Compress JavaScript content

<?php // compress JS
	header("content-type: text/javascript; charset: UTF-8");
	header("cache-control: must-revalidate");
	$offset = 365 * 24 * 60 * 60;
	$expire = "expires: ".gmdate("D, d M Y H:i:s", time() + $offset)." GMT";
	header($expire);
	if(!ob_start("ob_gzhandler")) ob_start();
?>
 
<?php // replace this line with as much JavaScript code as you want ?>
 
<?php ob_flush(); ?>

That’s all there is to it, and to further reduce file size, you should run the actual CSS/JavaScript code through the minifier of your choice.

For more information about either of these methods, check out my articles at Perishable Press:

Compressed CSS Compression http://perishablepress.com/compressed-css-compression/
Compressed JavaScript Compression http://perishablepress.com/compressed-javascript-compression/