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<?php

/**

* Easily compress all your CSS files into one streamlined file.

* This file strips your CSS of all unnecessary line breaks, spaces, and characters.

*

* @author Corey Worrell

* @url http://coreyworrell.com

* @version 1.1

*

* Usage:

* <link rel="stylesheet" type="text/css" href="css.php?reset,grid,styles" />

*

* Example folder structure:

* httpdocs

* - css

* - css.php

* - grid.css

* - reset.css

* - styles.css

* - js

* - img

* - index.html

*/

define('EXT', '.css');

$url = explode('?', $_SERVER['REQUEST_URI'], 2);

$cache = md5($url[1]).EXT;

$files = explode(',', $url[1]);

$cache_exists = file_exists($cache);

$cache_mtime = $cache_exists ? filemtime($cache) : NULL;

$compress = $cache_exists ? FALSE : TRUE;

foreach ($files as $key => $file)

{

$file = $files[$key] = $file.EXT;

if (strpos($file, '://') === FALSE)

{

if ( ! file_exists($file))

{

header('Content-type: text/html');

header('HTTP/1.1 400 Bad Request');

exit('File <code>'.$file.'</code> could not be found.');

}

if ( ! $compress AND filemtime($file) > $cache_mtime)

{

$compress = TRUE;

}

}

}

if ($compress)

{

$replace = array

(

'/\s+/' => ' ',

'/[\s+]?(;|:|{|}|,)[\s+]?/' => '$1',

'/[\t\r\n]/' => '',

'/\/\*(.*?)\*\//' => '',

'/;}/' => '}',

'/}(\s+)?/' => '}',

'/#([\da-f])\1([\da-f])\2([\da-f])\3/i' => '#$1$2$3',

'/([^\d])0(px|em|pt|ex|%|pc|cm|in|mm)/i' => '${1}0',

);

$css = '';

foreach ($files as $file)

{

$css .= file_get_contents($file);

}

$css = trim(preg_replace(array_keys($replace), array_values($replace), $css));

file_put_contents($cache, $css);

}

else

{

$css = file_get_contents($cache);

}

header('Content-type: text/css');

exit($css);