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);
?>