php面試題

一、php中error_reporting這個函數是幹什麼？
   答：設置錯誤級別與錯誤信息回報。
二、寫一個函數：一個文件夾下顯示全部文件和子文件夾
   答：  function showFile($filename){
                  $files=array();
                  if($handle=opendir($filename)){
                        while(($file=readdir($handle))!==false){
                               if($file!=".."&&file!="."){
                                       if(is_dir($filename."/".$file)){
                                          $files[$file]=scandir($filename."/".$file);
                                       }else{
                                          $files[]=$file;
                                      }
                                }
                        }
                        closedir($handle);
                  }
                  return $files;
            }