这篇文章主要介绍了关于PHP实现动态压缩js与css文件的方法，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

本文实例讲述了PHP实现动态压缩js与css文件的方法。分享给大家供大家参考，具体如下：

正式发布产品时，我们希望将项目里的js，css合并压缩，以减少http请求、防止轻易查看源代码。

使用

只需要在头部引入一下代码即可：

demo

//定义需要压缩的文件

$css = array(

CSS_PATH . 'base.css',

CSS_PATH . 'style.css',

CSS_PATH . 'my.css'

);

$js = array(

PUB_PATH . '/lib/zepto.min.js',

PUB_PATH . '/js/1.js',

JS_PATH . '2.js',

);

$css_path = base_url(parse_css($css));

$js_path = base_url(parse_script($js));

?>

这段代码会在指定的目录(例如common/)里生成压缩过后的js和css.每次更新了js,css内容，请先删除生成的压缩文件。

示例：4e387d5edce14cc2bd6396f6ebb7921b.css

7c10211f113f3175489196d336d67734.js

注意：

编写的css和js文件一定要符合规范。例如一定要加分号。js的function可以不加分号。

引用的资源/**

* 合并压缩css

*/

function parse_css($urls)

{

$url = md5(implode(',', $urls));

$path = FCPATH. 'static/parse/';

$css_url = $path . $url . '.css';

if (!file_exists($css_url)) {

if (!file_exists($path))

mkdir($path, 0777);

$css_content = '';

foreach ($urls as $url) {

$css_content .= @file_get_contents($url);

}

$css_content = str_replace("\r\n", '', $css_content); //清除换行符

$css_content = str_replace("\n", '', $css_content); //清除换行符

$css_content = str_replace("\t", '', $css_content); //清除制表符

$css_content = str_replace("../images/", "./../common/images/", $css_content);

@file_put_contents($css_url, $css_content);

}

$css_url = str_replace(FCPATH, '', $css_url);

return $css_url;

}

/**

* 合并压缩js

*/

function parse_script($urls)

{

$url = md5(implode(',', $urls));

$path = FCPATH. '/static/parse/';

$js_url = $path . $url . '.js';

if (!file_exists($js_url)) {

if (!file_exists($path))

mkdir($path, 0777);

load_qy_lib('JavaScriptPacker');

$js_content = '';

foreach ($urls as $url) {

$append_content = @file_get_contents($url) . "\r\n";

$packer = new JavaScriptPacker($append_content);

$append_content = $packer->_basicCompression($append_content);

$js_content .= $append_content;

}

@file_put_contents($js_url, $js_content);

}

$js_url = str_replace(FCPATH, '', $js_url);

return $js_url;

}

项目里引用到第三方类库JavaScriptPacker可以在github下载：

gkralik/php-uglifyjs

https://github.com/gkralik/php-uglifyjs/**

* 9 April 2008. version 1.1

*

* This is the php version of the Dean Edwards JavaScript's Packer,

* Based on :

*

* ParseMaster, version 1.0.2 (2005-08-19) Copyright 2005, Dean Edwards

* a multi-pattern parser.

* KNOWN BUG: erroneous behavior when using escapeChar with a replacement

* value that is a function

*

* packer, version 2.0.2 (2005-08-19) Copyright 2004-2005, Dean Edwards

*

* License: http://creativecommons.org/licenses/LGPL/2.1/

*

* Ported to PHP by Nicolas Martin.

*

* ----------------------------------------------------------------------

* changelog:

* 1.1 : correct a bug, '\0' packed then unpacked becomes '\'.

* ----------------------------------------------------------------------

*

* Changes:

* 2014-08-28: grkalik: change class for composer support. no functionality change.

*

*/

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