php怎么去除标签的属性

".$dir."

"; 
$path2='';
while ($file = readdir($dp)) //遍历目录
{
   if ($file !='.'&&$file !='..') //如果文件不是当前目录及父目录
   {    
    $path=$dir."/".$file; //获取路径
    if(is_dir($path)) //如果当前文件为目录
    {
     view_dir($path);   //递归调用
    }
    else   //如果不是目录
    {
 
//echo '';
 
   $path2 .= $path."\r\n";
   
   $c=file_get_contents($path);
//   $c = str_replace('http://4.28.99.196/chigb', "", $c);
//   $c1=array(' tppabs="/style/book.css" rel="stylesheet"',' tppabs="/chigb/up.gif"',' tppabs="/chigb/1pix.gif"',' tppabs="/chigb/left.gif"',' tppabs="/chigb/right.gif"');
//   $c2 = str_replace($c1, "", $c);
 
$del=array("/tppabs=.+?['|\"]/i");
$c2 = preg_replace($del,"",$c);
   $c2 = str_replace('" >', '">', $c2);
 
   file_put_contents($path,$c2);
//echo '';
//echo '';
//echo '';
//echo '';
//echo '
'.$path.'
 复制至XX
删除
';
    }
   }
}
return $path2."\r\n";
closedir($dp);
} 
$dir='E:book\chigb\x';
echo view_dir($dir);
 
 
 
 
 
$file='
文字1　文字2　文字3
';
$del=array("/name=.+?['|\"]/i","/src=.+?['|\"]/i","/id=.+?['|\"]/i","/width=.+?['|\"]/i","/height=.+?['|\"]/i","/usemap=.+?['|\"]/i","/shape=.+?['|\"]/i","/coords=.+?['|\"]/i","/target=.+?['|\"]/i","/title=.+?['|\"]/i");
$file = preg_replace($del,"",$file);//去除style样式
$file = str_replace(" ","",$file);//去除所有空格
$file = str_replace("登录后复制