1. 压缩css

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compress.php

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<?php
header('Content-type: text/css');
ob_start("compress");
function compress($buffer) {
	/* remove comments */
    $buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);
    /* remove tabs, spaces, newlines, etc. */
    $buffer = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $buffer);
    return $buffer;
}  

/* your css files */
include('galleria.css');
include('articles.css');

ob_end_flush();

实例化：

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test.php

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<link href="compress.php" rel="stylesheet" type="text/css" />
<span id="tester">test</span>

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2. 压缩js

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利用jsmin类

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来源：http://code.google.com/p/minify/

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compress.php

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header('Content-type: text/javascript');
require 'jsmin.php';
echo JSMin::minify(file_get_contents('common.js') . file_get_contents('common2.js'));

common.js

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alert('first js');

common.js

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alert('second js');

jsmin.php

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<?php
/**
 * jsmin.php - extended PHP implementation of Douglas Crockford's JSMin.
 *
 * <code>
 * $minifiedJs = JSMin::minify($js);
 * </code>
 *
 * This is a direct port of jsmin.c to PHP with a few PHP performance tweaks and
 * modifications to preserve some comments (see below). Also, rather than using
 * stdin/stdout, JSMin::minify() accepts a string as input and returns another
 * string as output.
 * 
 * Comments containing IE conditional compilation are preserved, as are multi-line
 * comments that begin with "/*!" (for documentation purposes). In the latter case
 * newlines are inserted around the comment to enhance readability.
 *
 * PHP 5 or higher is required.
 *
 * Permission is hereby granted to use this version of the library under the
 * same terms as jsmin.c, which has the following license:
 *
 * --
 * Copyright (c) 2002 Douglas Crockford  (www.crockford.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * The Software shall be used for Good, not Evil.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * --
 *
 * @package JSMin
 * @author Ryan Grove <ryan@wonko.com> (PHP port)
 * @author Steve Clay <steve@mrclay.org> (modifications + cleanup)
 * @author Andrea Giammarchi <http://www.3site.eu> (spaceBeforeRegExp)
 * @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c)
 * @copyright 2008 Ryan Grove <ryan@wonko.com> (PHP port)
 * @license http://opensource.org/licenses/mit-license.php MIT License
 * @link http://code.google.com/p/jsmin-php/
 */

class JSMin {
    const ORD_LF            = 10;
    const ORD_SPACE         = 32;
    const ACTION_KEEP_A     = 1;
    const ACTION_DELETE