PHP动态压缩js,css

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：

    <meta charset="utf-8"/>
    <title>demo</title>

    <?php
    //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));

    ?>

    <link rel="stylesheet" type="text/css" href="<?php echo $css_path ?>">
    <script src="<?php echo $js_path ?>"></script>

    <!--下面可以继续放不能压缩或者不想压缩的文件-->
    <script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>

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：

/**
 * 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.
 *
 */