php简单压缩css样式示例

$css = '';
//找css目录
$root = $_SERVER['DOCUMENT_ROOT'].'/css/'; //directory where the css lives
$files = explode(',',$_SERVER['QUERY_STRING']);
if(sizeof($files))
{
  foreach($files as $file)
  {
    $css.= (is_file($root.$file.'.css') ? file_get_contents($root.$file.'.css') : '');
  }
}
return str_replace('; ',';',str_replace(' }','}',str_replace('{ ','{',str_replace(array("\r\n","\r","\n","\t",' ','  ','  '),"",preg_replace('!/\[^]\+([^/][^]\+)/!','',$css)))));