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)))));