如何批量修改php文件

<?php
 $folder="D:U";
 //打开目录
$fp=opendir($folder);
$find=array("admanage","admin","adtype","maintype","diymenu","getmode","goods","goodsattr","goodsbrand","goodsflag","goodsorder","goodsreview","goodstype","infoflag","infoclass","infoimg","infolist","job","lnk","member","message","paymode","postarea","postmode","soft","vote","webconfig","weblink","weblinktype","info");
$replace=array("admanage_en","admin_en","adtype_en","maintype_en","diymenu_en","getmode_en","goods_en","goodsattr_en","goodsbrand_en","goodsflag_en","goodsorder_en","goodsreview_en","goodstype_en","infoflag_en","infoclass_en","infoimg_en","infolist_en","job_en","lnk_en","member_en","message_en","paymode_en","postarea_en","postmode_en","soft_en","vote_en","webconfig_en","weblink_en","weblinktype_en","info_en");
$cnt=count($find);
 //阅读目录
while(false!=$file=readdir($fp))
{
//列出所有文件并去掉'.'和'..'
    if($file!='.' &&$file!='..')
    {
        //$file="$folder/$file";
        $file="$file";
        //赋值给数组
        $arr_file[]=$file;
        }
}
 //输出结果
 if(is_array($arr_file))
 {
    while(list($key,$value)=each($arr_file))
    {
        $name=strrev(substr(strrev($value),4));
        $fw = fopen($folder.'\'.$name."_en.php","w");
        $fr = fopen($folder.'\'.$value, "r");
        while (!feof($fr))
        {
               $line = fgets($fr);
               if(strstr($line,"#@__"))
            {
                for($i=0;$i<$cnt;$i++)
                    if(strstr($line,$find[$i]))
                    {
                        $line=str_replace($find[$i],$replace[$i],$line);
                        break;
                    }
            }
            fputs($fw,$line);
        }
        fclose($fr);
        fclose($fw);
    }
   }
//关闭目录
closedir($fp);
?>