自己写了段程序感觉不错，分享下~

#! /usr/bin/php
<?php

# ================================================================================
# CSS Compression Programme
# author: Zhang Jiuzhou
# date  : 2013-10-15
# descp : compress multiple css files within several single files.
# usage : php main.php source_folder [destination folder]


# sapi check
if (stripos(php_sapi_name(), 'cli') === false) {
    throw new UsageError('This programme is cli only.');
}

# register exception handler
set_exception_handler('exception_handler');

# arg parse and validate
if ($argc < 2) {
    throw new UsageError('Require an argument of your source dir.');
}
$source = rtrim(trim($argv[1]), '/');
check_source_dir($source);
if ($argc >= 3) {
    $destination = rtrim(trim($argv[2]), '/');
} else {
    $destination = rtrim(getcwd(), '/');
}
check_source_dir($destination);

# make main dir
date_default_timezone_set('Asia/Shanghai');
$dirname = $destination . '/' . date('Ymd');
if (is_dir($dirname)) {
    throw new UsageError(sprintf('Dir %s is already exists.', $dirname));
}
if (!@mkdir($dirname)) {
    throw new IOError(sprintf('Cannot make new dir %s.', $source));
}

# import files and compress
chdir($source);
$files = glob('*.css');
$imported_list = array();
foreach ($files as $file) {
    read_and_import($file, $dirname . '/' . basename($file), $imported_list);
}

# copy files
$source_real = rtrim(realpath($source), '/') . '/';
chdir($dirname);
foreach ($imported_list as $srcname) {
    $src_relative_path = str_replace($source_real, '', $srcname);
    $src_dir_relative_path = dirname($src_relative_path);
    if (!is_dir($src_dir_relative_path)) {
        if (!@mkdir($src_dir_relative_path, 0755, true)) {
            throw new IOError(sprintf('Cannot create directory %s while copying files.', $src_dir_relative_path));
        }
    }
    if (!@copy($srcname, $src_relative_path)) {
        throw new IOError(sprintf('Cannot copy file %s.', $src_relative_path));
    }
}

exit(0);

# ================================================================================
# library

# class definitions
class UsageError extends Exception {
}

class IOError extends Exception {
}


# function definitions
/**
 * Check path param
 * @param str $dirname
 */
function check_source_dir($dirname) {
    if (empty($dirname)) {
        throw new UsageError('Path should not be empty.');
    }
    if (!is_dir($dirname)) {
        throw new UsageError(sprintf('Path %s is not a valid directory.', $dirname));
    }
}

/**
 * Exception handler function
 */
function exception_handler(Exception $e) {
    if ($e instanceof UsageError) {
        echo sprintf('Usage error: %s' . PHP_EOL, $e->getMessage());
        exit(1);
    } else {
        echo sprintf('Unchaught exception: %s' . PHP_EOL, $e->getMessage());
        debug_print_backtrace();
        exit(2);
    }
}

/**
 * Read data from files, "import" and compress.
 * @param str     $src;
 * @param str     $dest;
 * @param Array & $imported_list;
 */
function read_and_import($src, $dst, Array & $imported_list) {
    $out = @fopen($dst, 'w');
    if (!$out) {
        throw new IOError(sprintf('Cannot open destination file %s.', $dst));
    }

    _read_and_import($src, $out, $imported_list);
}

function _read_and_import($src, $out, & $import_list) {
    $in_comment_block = false;
    $in = @fopen($src, 'r');
    if (!$in) {
        throw new IOError(sprintf('Cannot open source file %s.', $src));
    }

    while (!feof($in)) {
        $line = trim(fgets($in));
        if (preg_match('/^@import "(.*)";$/i', trim($line), $matches)) {
            $import = $matches[1];
            $orign = getcwd();
            chdir(dirname($src));
            $import_list[] = realpath($import);
            _read_and_import($import, $out, $import_list);
            chdir($orign);
        } else {
            # remove single-line comment
            $line = preg_replace('#/\*.*\*/#i', '', $line);

            # remove multi-line comment
            $startpos = strpos($line, '/*');
            $endpos = strpos($line, '*/');
            if (!$in_comment_block && $startpos !== false) {
                $line = substr($line, 0, $startpos);
                $in_comment_block = true;
            } else if ($in_comment_block && $endpos !== false) {
                $in_comment_block = false;
                $line = substr($line, $endpos + 2);
            } else if ($in_comment_block) {
                $line = '';
            }

            # filter other spaces
            $line = preg_replace('/\s*;\s*/', ';', $line);
            $line = preg_replace('/\s*{\s*/', '{', $line);
            $line = preg_replace('/\s*}\s*/', '}', $line);
            $line = trim($line);

            if (strlen($line) > 0) {
                fputs($out, $line, strlen($line));
            }
        }
    }

    fclose($in);
}