压缩多个CSS与JS文件的php代码

    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： test.php

test

2. 压缩js 利用jsmin类 来源：http://code.google.com/p/minify/ compress.php

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

common.js alert('first js');

common.js alert('second js');

jsmin.php

    /**
     * jsmin.php - extended PHP implementation of Douglas Crockford's JSMin.
     *
     *  <li>     * $minifiedJs = JSMin::minify($js); </li>
<li>     * </li>
     *
     * 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  (PHP port)
     * @author Steve Clay  (modifications + cleanup)
     * @author Andrea Giammarchi  (spaceBeforeRegExp)
     * @copyright 2002 Douglas Crockford  (jsmin.c)
     * @copyright 2008 Ryan Grove  (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_A   = 2;
        const ACTION_DELETE_A_B = 3;

        protected $a           = "\n";
        protected $b           = '';
        protected $input       = '';
        protected $inputIndex  = 0;
        protected $inputLength = 0;
        protected $lookAhead   = null;
        protected $output      = '';

        /**
         * Minify Javascript
         *
         * @param string $js Javascript to be minified
         * @return string
         */
        public static function minify($js)
        {
            // look out for syntax like "++ +" and "- ++"
            $p = '\\+';
            $m = '\\-';
            if (preg_match("/([$p$m])(?:\\1 [$p$m]| (?:$p$p|$m$m))/", $js)) {
                // likely pre-minified and would be broken by JSMin
                return $js;
            }
            $jsmin = new JSMin($js);
            return $jsmin->min();
        }

        /*
         * Don't create a JSMin instance, instead use the static function minify,
         * which checks for mb_string function overloading and avoids errors
         * trying to re-minify the output of Closure Compiler
         *
         * @private
         */
        public function __construct($input)
        {
            $this->input = $input;
        }

        /**
         * Perform minification, return result
         */
        public function min()
        {
            if ($this->output !== '') { // min already run
                return $this->output;
            }

            $mbIntEnc = null;
            if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) {
                $mbIntEnc = mb_internal_encoding();
                mb_internal_encoding('8bit');
            }
            $this->input = str_replace("\r\n", "\n", $this->input);
            $this->inputLength = strlen($this->input);

            $this->action(self::ACTION_DELETE_A_B);

            while ($this->a !== null) {
                // determine next command
                $command = self::ACTION_KEEP_A; // default
                if ($this->a === ' ') {
                    if (! $this->isAlphaNum($this->b)) {
                        $command = self::ACTION_DELETE_A;
                    }
                } elseif ($this->a === "\n") {
                    if ($this->b === ' ') {
                        $command = self::ACTION_DELETE_A_B;
                    // in case of mbstring.func_overload & 2, must check for null b,
                    // otherwise mb_strpos will give WARNING
                    } elseif ($this->b === null
                              || (false === strpos('{[(+-', $this->b)
                                  && ! $this->isAlphaNum($this->b))) {
                        $command = self::ACTION_DELETE_A;
                    }
                } elseif (! $this->isAlphaNum($this->a)) {
                    if ($this->b === ' '
                        || ($this->b === "\n"
                            && (false === strpos('}])+-"\'', $this->a)))) {
                        $command = self::ACTION_DELETE_A_B;
                    }
                }
                $this->action($command);
            }
            $this->output = trim($this->output);

            if ($mbIntEnc !== null) {
                mb_internal_encoding($mbIntEnc);
            }
            return $this->output;
        }

        /**
         * ACTION_KEEP_A = Output A. Copy B to A. Get the next B.
         * ACTION_DELETE_A = Copy B to A. Get the next B.
         * ACTION_DELETE_A_B = Get the next B.
         */
        protected function action($command)
        {
            switch ($command) {
                case self::ACTION_KEEP_A:
                    $this->output .= $this->a;
                    // fallthrough
                case self::ACTION_DELETE_A:
                    $this->a = $this->b;
                    if ($this->a === "'" || $this->a === '"') { // string literal
                        $str = $this->a; // in case needed for exception
                        while (true) {
                            $this->output .= $this->a;
                            $this->a       = $this->get();
                            if ($this->a === $this->b) { // end quote
                                break;
                            }
                            if (ord($this->a)                                 throw new JSMin_UnterminatedStringException(
                                    "JSMin: Unterminated String at byte "
                                    . $this->inputIndex . ": {$str}");
                            }
                            $str .= $this->a;
                            if ($this->a === '\\') {
                                $this->output .= $this->a;
                                $this->a       = $this->get();
                                $str .= $this->a;
                            }
                        }
                    }
                    // fallthrough
                case self::ACTION_DELETE_A_B:
                    $this->b = $this->next();
                    if ($this->b === '/' && $this->isRegexpLiteral()) { // RegExp literal
                        $this->output .= $this->a . $this->b;
                        $pattern = '/'; // in case needed for exception
                        while (true) {
                            $this->a = $this->get();
                            $pattern .= $this->a;
                            if ($this->a === '/') { // end pattern
                                break; // while (true)
                            } elseif ($this->a === '\\') {
                                $this->output .= $this->a;
                                $this->a       = $this->get();
                                $pattern      .= $this->a;
                            } elseif (ord($this->a)                                 throw new JSMin_UnterminatedRegExpException(
                                    "JSMin: Unterminated RegExp at byte "
                                    . $this->inputIndex .": {$pattern}");
                            }
                            $this->output .= $this->a;
                        }
                        $this->b = $this->next();
                    }
                // end case ACTION_DELETE_A_B
            }
        }

        protected function isRegexpLiteral()
        {
            if (false !== strpos("\n{;(,=:[!&|?", $this->a)) { // we aren't dividing
                return true;
            }
            if (' ' === $this->a) {
                $length = strlen($this->output);
                if ($length                     return true;
                }
                // you can't divide a keyword
                if (preg_match('/(?:case|else|in|return|typeof)$/', $this->output, $m)) {
                    if ($this->output === $m[0]) { // odd but could happen
                        return true;
                    }
                    // make sure it's a keyword, not end of an identifier
                    $charBeforeKeyword = substr($this->output, $length - strlen($m[0]) - 1, 1);
                    if (! $this->isAlphaNum($charBeforeKeyword)) {
                        return true;
                    }
                }
            }
            return false;
        }

        /**
         * Get next char. Convert ctrl char to space.
         */
        protected function get()
        {
            $c = $this->lookAhead;
            $this->lookAhead = null;
            if ($c === null) {
                if ($this->inputIndex inputLength) {
                    $c = $this->input[$this->inputIndex];
                    $this->inputIndex += 1;
                } else {
                    return null;
                }
            }
            if ($c === "\r" || $c === "\n") {
                return "\n";
            }
            if (ord($c)                 return ' ';
            }
            return $c;
        }

        /**
         * Get next char. If is ctrl character, translate to a space or newline.
         */
        protected function peek()
        {
            $this->lookAhead = $this->get();
            return $this->lookAhead;
        }

        /**
         * Is $c a letter, digit, underscore, dollar sign, escape, or non-ASCII?
         */
        protected function isAlphaNum($c)
        {
            return (preg_match('/^[0-9a-zA-Z_\\$\\\\]$/', $c) || ord($c) > 126);
        }

        protected function singleLineComment()
        {
            $comment = '';
            while (true) {
                $get = $this->get();
                $comment .= $get;
                if (ord($get)                     // if IE conditional comment
                    if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
                        return "/{$comment}";
                    }
                    return $get;
                }
            }
        }

        protected function multipleLineComment()
        {
            $this->get();
            $comment = '';
            while (true) {
                $get = $this->get();
                if ($get === '*') {
                    if ($this->peek() === '/') { // end of comment reached
                        $this->get();
                        // if comment preserved by YUI Compressor
                        if (0 === strpos($comment, '!')) {
                            return "\n/*" . substr($comment, 1) . "*/\n";
                        }
                        // if IE conditional comment
                        if (preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
                            return "/*{$comment}*/";
                        }
                        return ' ';
                    }
                } elseif ($get === null) {
                    throw new JSMin_UnterminatedCommentException(
                        "JSMin: Unterminated comment at byte "
                        . $this->inputIndex . ": /*{$comment}");
                }
                $comment .= $get;
            }
        }

        /**
         * Get the next character, skipping over comments.
         * Some comments may be preserved.
         */
        protected function next()
        {
            $get = $this->get();
            if ($get !== '/') {
                return $get;
            }
            switch ($this->peek()) {
                case '/': return $this->singleLineComment();
                case '*': return $this->multipleLineComment();
                default: return $get;
            }
        }
    }

    class JSMin_UnterminatedStringException extends Exception {}
    class JSMin_UnterminatedCommentException extends Exception {}
    class JSMin_UnterminatedRegExpException extends Exception {}
?>

调用示例：