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：

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("rn", '', $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) . "rn";
      $packer = new JavaScriptPacker($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, '