有的网站有很多的 CSS 文件,如果将它们合并到一起并且进行 Gzip 压缩会减少请求和文件大小,有利于提高网站加载速度。为了方便我不推荐人工压缩和合并 CSS,而是使用 PHP 代码。
首先将所有 CSS 放到一个目录里,然后在此目录新建一个空的 CSS 文件,命名为 css.php,其实除了后缀命名随便.然后在 PHP 文件里放下边的代码:
- <?php
- header('Content-type: text/css');
- ob_start("compress");
- function compress($buffer) {
- $buffer = preg_replace('!/*[^*]**+([^/][^*]**+)*/!', '', $buffer);
- $buffer = str_replace(array("rn", "r", "n", "t", ' ', ' ', ' '), '', $buffer);
- return $buffer;
- }
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- foreach( glob( "*.css" ) as $filename ) include $filename;
- ob_end_flush();
- ?>
引入 CSS 文件的代码换成引入这个 PHP 文件,例如:
- <link rel='stylesheet' id='style-css' href='/css/css.php' type='text/css' media='all' />
压缩多个css为一个css,代码如下:
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- ob_start("ob_gzhandler");
- header("Content-type: text/css; charset: UTF-8");
- header("Expires: ".gmdate("D, d M Y H:i:s", time() + 60*60)." GMT");
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- include('somefile.css');
- echo "nn";
- include('anotherfile.css');
- echo "nn";
-
- ob_flush();
下面整理可压缩css,js的函数,代码如下:
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- function parse_css($urls,$path="./static/",$tmpl_path='.'){
- $url = md5(implode(',',$urls));
- $css_url = $path.$url.'.css';
- if(!file_exists($css_url)){
- if(!file_exists($path))mkdir($(www.phpfensi.com)path,0777);
- $css_content = '';
- foreach($urls as $url){
- $css_content .= @file_get_contents($url);
- }
- $css_content = preg_replace("/[rn]/",'',$css_content);
- $css_content = str_replace("../images/",$tmpl_path."/images/",$css_content);
- @file_put_contents($css_url,$css_content);
- }
- return $css_url;
- }
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- function parse_script($urls,$path="./static/"){
- $url = md5(implode(',',$urls));
- $js_url = $path.$url.'.js';
- if(!file_exists($js_url))
- {
- if(!file_exists($path))mkdir($path,0777);
- require_once "inc/javascriptpacker.php";
- $js_content = '';
- foreach($urls as $url)
- {
- $append_content = @file_get_contents($url)."rn";
- $packer = new JavaScriptPacker($append_content);
- $append_content = $packer->pack();
- $js_content .= $append_content;
- }
- @file_put_contents($js_url,$js_content);
- }
- return $js_url;
- }
前台js调用:
- <?php
- $pagejs[] = $tplurl."js/jump.js";
- $jsfile=parse_script($pagejs,"./template/default/js/",".");
- ?>
- <script type="text/javascript" src="<?=$jsfile?>"></script>
前台css调用:
- <?php
- $pagecss[] = $tplurl."style/index_top.css";
- $pagecss[] = $tplurl."style/index.css";
- $cssfile=parse_css($pagecss,"./template/default/style/",".");
- ?>
- <link rel="stylesheet" type="text/css" href="<?=$cssfile?>" />
PHP 文件里就包含了所有被压缩的 CSS 代码,而且可以自动引入 CSS 目录里的所有 CSS 文件,不用在新建 CSS 文件的时候再修改这个 PHP 文件. |