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    <?php
    $path='D:/wamp/www/DolrPHP/Smarty';
    function loseWeight($path){
        $handle=opendir($path);
        readdir($handle);//.
        readdir($handle);//..
        while($file=readdir($handle)){
            $newPath=$path.'/'.$file;
            if(is_dir($newPath))
                loseWeight($newPath);
            else{
                //去掉注释行---
                $content=file_get_contents($newPath);
                $mode=array('/\/\*\*?(.*?)\*\//is','/^\s*$/iU');
                $newContent=preg_replace($mode,"",$content);
                file_put_contents($newPath,$newContent);
                //-----
                // 去掉空白行
                $content='';
                $fp=fopen($newPath,'r');
                while(!feof($fp)){
                    $line=trim(fgets($fp));
                    if(strlen($line)<=0){
                        continue;
                    }
                    $content.=$line."\n";
                }
                file_put_contents($newPath,$content);
                echo '文件'.$newPath.'瘦身完成!<br />';
            }
        }
    }
    show($path);