php把html批量转换成txt文件

<?php
function html2text($str){ 
  $str = preg_replace("/<style .*?</style>/is", "", $str);
  $str = preg_replace("/<script .*?</script>/is", "", $str);
  $str = preg_replace("/n|r/", "", $str);//先把文本中所有的换行替换为空，避免下面替换换行时冲突
  $str = preg_replace("/<brs?/?>/i", "n", $str);
  $str = preg_replace("/</p>/i", "nn", $str);
  $str = preg_replace("/</?td>/i", "n", $str);
  $str = preg_replace("/</?div>/i", "n", $str);
  $str = preg_replace("/</?blockquote>/i", "n", $str);
  $str = preg_replace("/</?li>/i", "n", $str);
  $str = preg_replace("/&nbsp;/i", " ", $str);
  $str = preg_replace("/&amp;/i", "&", $str);
  $str = preg_replace("/&lt;/i", "<", $str);
  $str = preg_replace("/&gt;/i", ">", $str);
  $str = preg_replace("/&quot;/i", '"', $str);
  $str = preg_replace("/&ldquo;/i", '“', $str);
  $str = preg_replace("/&rdquo;/i", '”', $str);
  $str = preg_replace("/&lsquo;/i", "‘", $str);
  $str = preg_replace("/&rsquo;/i", "’", $str);
  $str = preg_replace("/&mdash;/i", '—', $str);
  $str = preg_replace("/&hellip;/i", '…', $str);
  $str = preg_replace("/&middot;/i", '·', $str);
  $str = preg_replace("/&times;/i", '×', $str);
  //如果有特殊需求，请在本行下面按照以上格式继续加html特殊符号和转换后的符号
  $str = strip_tags($str);//去除空字符、html 和 php 标记
  $str = html_entity_decode($str, ent_quotes, $encode);//解码双引号和单引号 &#039;
  $str = preg_replace("/&#.*?;/i", "", $str); //替换所有&#开始;结尾的特殊字符
 return $str;
}
?>
 

<?php
//要读取的目录
 $folder='e:apmservwwwhtdocstoolhtml-to-txtfiles';
//打开目录
$fp=opendir($folder);
//阅读目录
while (($file = readdir($fp)) !== false){
$filetype = substr ( $file, strripos ( $file, "." ) + 1 );
$filename=substr($file,0,strrpos($file,'.'));
if($file!='.' &&$file!='..'&&$filetype == "html"){
echo $filename.'<br />';
$content=file_get_contents("$folder/$file");
//打开文件
$op = fopen("$folder/$filename.txt", 'a');
//写入文件
fwrite($op,html2text($content));
//关闭文件
fclose($op);
//删除html文件
unlink("$folder/$file");
}
}
//关闭目录
closedir($fp);
?>