CSS Compression and Cache Script

<?php
/*
    Script: Load a uncompressed CSS File,
        compress it and saved it in a cache folder and returns the compressed CSS.

    Author $ Blade83

    Usage:
    Safe this into a php file.
    Write in your HTML Code:
    <link href="your_php_file.php?css=style.css" rel="stylesheet" type="text/css" />
    This will open and output the style.css file in a compressed format.
    Optional Parameters in href are
    - &no_compress=1   <- outputs the uncompressed css
    - &no_cache=1   <- compress on the fly and returns it
*/

define('CACHE_FOLDER',              'cache');                                                           # single folder or recursive (folder1/folder2/folder3) folders
define('CACHE_FOLDER_CHMOD',        0755);                                                              # CHMOD for Cache folder
define('CACHE_TIME',                120);                                                               # Expiretime in seconds for cached files
define('CACHE_FILE_SUFIX',          'css_cache_');                                                      # Prefix for cached style sheets
define('HEADER_SEND_FILE_EXPIRE',   86400);                                                             # Browser expiretimes for files
$no_compress                        = ($_GET['no_compress']==1) ? 1 : 0;
$no_cache                           = ($_GET['no_cache']==1) ? 1 : 0;
$filename                           = $_GET['css'];
$cssFile                            = (preg_match("/^[A-Za-z_.]+$/", trim($filename))) ? trim($filename) : NULL;
$buffer                             = @file_get_contents($cssFile);

function send_css_header($buffer, $buffer_error='')
{
    global $cssFile;
    ob_start("ob_gzhandler");
    header('Cache-Control: public');
    header('Expires: ' . gmdate('D, d M Y H:i:s', time() + HEADER_SEND_FILE_EXPIRE) . ' GMT');
    header("Content-type: text/css");
    $_ = "\x24\x63\x6F\x70\x79\x72\x69\x67\x68\x74\x20\x3D\x20\x22\x2F\x2A\x0D\x0A\x09\x56\x69\x72\x74\x75\x61\x6C\x57\x61\x72\x73\x20\x43\x53\x53\x20\x43\x6F\x6D\x70\x72\x65\x73\x73\x6F\x72\x0D\x0A\x09\x41\x75\x74\x68\x6F\x72\x3A\x20\x24\x20\x42\x6C\x61\x64\x65\x38\x33\x0D\x0A\x09\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x2D\x0D\x0A\x09\x46\x69\x6C\x65\x69\x6E\x66\x6F\x72\x6D\x61\x74\x69\x6F\x6E\x3A\x0D\x0A\x09\x46\x69\x6C\x65\x6E\x61\x6D\x65\x3A\x09\x09\x09\x22\x2E\x24\x63\x73\x73\x46\x69\x6C\x65\x2E\x22\x0D\x0A\x09\x52\x65\x61\x6C\x20\x46\x69\x6C\x65\x70\x61\x74\x68\x3A\x09\x09\x09\x22\x2E\x40\x64\x69\x72\x6E\x61\x6D\x65\x28\x5F\x5F\x46\x49\x4C\x45\x5F\x5F\x29\x2E\x22\x0D\x0A\x09\x46\x69\x6C\x65\x73\x69\x7A\x65\x20\x75\x6E\x63\x6F\x6D\x70\x72\x65\x73\x73\x65\x64\x3A\x09\x09\x22\x2E\x40\x66\x69\x6C\x65\x73\x69\x7A\x65\x28\x24\x63\x73\x73\x46\x69\x6C\x65\x29\x2E\x22\x20\x42\x79\x74\x65\x73\x0D\x0A\x09\x46\x69\x6C\x65\x73\x69\x7A\x65\x20\x63\x6F\x6D\x70\x72\x65\x73\x73\x65\x64\x3A\x09\x09\x22\x2E\x40\x66\x69\x6C\x65\x73\x69\x7A\x65\x28\x43\x41\x43\x48\x45\x5F\x46\x4F\x4C\x44\x45\x52\x20\x2E\x20\x27\x2F\x27\x20\x2E\x20\x43\x41\x43\x48\x45\x5F\x46\x49\x4C\x45\x5F\x53\x55\x46\x49\x58\x20\x2E\x20\x24\x63\x73\x73\x46\x69\x6C\x65\x29\x2E\x22\x20\x42\x79\x74\x65\x73\x0D\x0A\x09\x22\x2E\x22\x5C\x6E\x2A\x2F\x22\x3B";
    $__ = "\x65\x63\x68\x6F\x20\x24\x63\x6F\x70\x79\x72\x69\x67\x68\x74\x2E\x22\x5C\x6E\x22\x2E\x24\x62\x75\x66\x66\x65\x72\x5F\x65\x72\x72\x6F\x72\x2E\x22\x5C\x6E\x22\x2E\x24\x62\x75\x66\x66\x65\x72\x3B";
    eval($_ . $__);
    ob_end_flush();
}
function compress_css($css)
{
    global $cssFile;
    $replace_arr = array(
                        "\r\n",
                        "\r",
                        "\n",
                        "\t",
                        '  ',
                        '    ',
                        '    '
                    );
    $compressed = str_replace($replace_arr, '', str_replace(': ', ':', preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $css)));
    return $compressed;
}
function write_cache($compressed_css)
{
    global $cssFile;
    if (!$handle = @fopen(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile, 'w'))
    {
        $buffer_error .= '/* Can not open file "'.CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile.'" */'."\n";
    }
    if (is_writable(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile))
    {
        if (@fwrite($handle, $compressed_css) === FALSE)
        {
            $buffer_error .= '/* Can not write to file "'.CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile.'" */'."\n";
        }
        @fclose($handle);
        $filemtime = @filemtime(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile);
    }
    else
    {
        $buffer_error .= '/* The file "'.CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile.'" is not writable */'."\n";
    }
    return $buffer_error;
}
if ($buffer == FALSE)
{
    $buffer_error = "/* Error: File \"$cssFile\" not found! */";
    send_css_header('', $buffer_error);
    exit;
}
if ($no_compress==1)
{
    send_css_header($buffer, "/* Send method: No Compression */"."\n");
    exit;
}
else
{
    if ($no_cache==1)
    {
        send_css_header(compress_css($buffer), "/* Send method: Compressed on the fly */"."\n");
        exit;
    }
    else
    {
        if(!is_dir(CACHE_FOLDER))
        {
            $buffer_error .= '/* Error: Folder "' . CACHE_FOLDER . '" not found in "'.@dirname(__FILE__).'/"! */'."\n";
            $buffer_error .= '/* Trying to create folder "' . CACHE_FOLDER . '" in "'.@dirname(__FILE__).'/": ........ ';
            $oldumask = umask(0);
            $buffer_error .= (mkdir(CACHE_FOLDER, CACHE_FOLDER_CHMOD, true))?'Created!':'Error!';
            umask($oldumask);
            $buffer_error .= ' */'."\n";
        }
        if (!file_exists(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile))
        {
            $buffer = compress_css($buffer);
            $buffer_error .= write_cache($buffer);
            $filemtime = @filemtime(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile);
            $buffer_error .= '/* Send method: Cached, expired in: '.(($filemtime+CACHE_TIME)-time()).'s */';
            send_css_header(@file_get_contents(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile), $buffer_error);
            exit;
        }
        else
        {
            $filemtime = @filemtime(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile);
            if ( (time()-$filemtime) >= CACHE_TIME )
            {
                @unlink(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile);
                $buffer = compress_css($buffer);
                $buffer_error .= write_cache($buffer);
                $filemtime = @filemtime(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile);
            }
            $buffer_error .= '/* Send method: Cached, expired in: '.(($filemtime+CACHE_TIME)-time()).'s */';
            send_css_header(@file_get_contents(CACHE_FOLDER . '/' . CACHE_FILE_SUFIX . $cssFile), $buffer_error);
        }
    }
}
?>