具体方法如下:

function test()
{
  $hostdir= iconv("utf-8","gbk","C:\Users\原万里\Desktop\日常笔记") ; //iconv()转换编码方式，将UTF-8转换为gbk，若是报错在gbk后加//IGNORE
  $filesnames = scandir($hostdir); //scandir() 函数返回指定目录中的文件和目录的数组。默认升序排列，
  foreach ($filesnames as $name) {
       if($name!=".." && $name!=".") //遍历结果中会多出‘.'以及‘..'，没有用处，不予处理;
       {
         $cipath = $hostdir.$name;
         $cjfilenames = scandir($cipath); //根据情况再决定是否再向下遍历一次
         foreach($cjfilenames as $cjname)
         {
            if($cjname!=".." && $cjname!="." &&!is_dir($cipath."/".$cjname))
             {
               $str = file_get_contents($cipath."/".$cjname);
               file_put_contents("e:/test.txt",$str,FILE_APPEND);
             }
         }
       }
     echo "\n";
  }
}