classe per effettuare il backup , che viene stampata a video

[rocco.mod]

buon giorno a tutti , ho guardato nel sito ufficiale di php in più ho dato un occhiata al files di phpMyAdmin export.php , dovrebbe essere corretta , ma non mi funziona perche ? dove toppo ?

        function _out( $dump )
        {
         if(empty($this->filename) ){
         $this->filename = DATABASE_NAME .".".date("d")."_".date("M")."_".date("Y")."_".date("H")."_".date("i")."_".date("s");
         }else{
         $this->filename = $filename .".".date("d")."_".date("M")."_".date("Y")."_".date("H")."_".date("i")."_".date("s");
         } 
         if($this->compress  && extension_loaded("zlib")) {
         $this->ext = "sql.gz";
         $this->content_encoding = 'x-gzip';
         $this->mime_type = 'application/x-gzip';
         }else{
         $this->ext = "sql";
         $this->content_encoding = '';
         $this->mime_type = 'text/x-sql';
         }
          if($this->save_on_server) {
          $dir = "./includes/";
          $files = "Backup";
          if(!is_dir($dir.$files))
          {
             mkdir($dir . $files , 0777);  
             chmod($dir . $files , 0777); 
          }
          $handle = fopen($dir . $files ."/" . $this->filename .'.'. $this->ext, "wb" );
          if($handle){
             if($this->compress){
                    $gzbackupData = "\x1f\x8b\x08\x00\x00\x00\x00\x00" . substr(gzcompress($dump, 9), 0, -4 ) . pack('V', crc32($dump)) . pack('V', strlen($dump));
                    fwrite( $handle, $gzbackupData );
             }else{
                    fwrite($handle, $dump );
             }
                    fclose($handle);
          }          
          }
            
             ob_start();    
             if($this->compress && extension_loaded("zlib"))
             {  
             $this->perform_backup($this->filename,$this->ext, $this->content_encoding ,$this->mime_type);
             $dump = ob_get_contents();
                    $gzbackupData = "\x1f\x8b\x08\x00\x00\x00\x00\x00" . substr(gzcompress($dump, 9), 0, -4 ) . pack('V', crc32($dump)) . pack('V', strlen($dump));
                    echo $gzbackupData;
             }else{  
             $this->perform_backup($this->filename,$this->ext, $this->content_encoding ,$this->mime_type);
             $dump = ob_get_contents();
             echo $dump;
             }ob_end_clean();
        }

        function perform_backup($filename , $ext , $content_encoding , $mime_type)
        {
        if (!empty($content_encoding)) {
        header('Content-Encoding: ' . $content_encoding);
        }
        header('Content-Type: ' . $mime_type);
        header('Expires: ' . gmdate('D, d M Y H:i:s') . ' GMT');
        // lem9 & loic1: IE need specific headers
        if ($this->_get_browser_type() == 'IE') {
        header('Content-Disposition: inline;  filename="' . $filename . '.' . $ext . '"');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        } else {
        header('Content-Disposition: attachment;  filename="' . $filename . '.' . $ext . '"');
        header('Pragma: no-cache');
        }
        readfile('"' . $filename . '.' . $ext . '"');
        }