Class File Text Generator PHP

// Class Untuk Membuat File Text dan Membaca File Text
// Masukkan kedalam file "system/GF_Text.php"
class File_Generator
      {
        private $content_data;
        private $file_name;
        private $message_die = "Unable to open file !";
        private $length_file = false;


        public function setData($content)
        {
          if ($content)
          {
            $this->content_data = $content;
          }
        }

        public function setMessageDie($value = "")
        {
          $this->message_die = $value;
        }

        public function setFile($value = 'default.txt')
        {
            $this->file_name = $value;
        }

        public function create()
        {
          if (is_array($this->file_name))
            {
              for ($i=0; $i < count($this->file_name) ; $i++)
              {
                    $fn =  __STORAGE_DIR__.$this->file_name[$i] ;

                    if (strpos($fn, '/') !== false)
                    {
                        if (! is_dir(dirname($fn,1)))
                        {
                          mkdir(dirname($fn,1), 0777, true);
                        }
                    }
                    $file   = fopen($fn, "w") or die($this->message_die." : ".$this->file_name);
                    fwrite($file, $this->content_data);
                    fclose($file);
              }
            }
            else
            {
                $file   = fopen(__STORAGE_DIR__.$this->file_name, "w") or die($this->message_die);
                fwrite($file, $this->content_data);
                fclose($file);
            }
        }

        public function read()
        {
            if (file_exists(__STORAGE_DIR__.$this->file_name))
            {
                $file = fopen(__STORAGE_DIR__.$this->file_name, "r") or die($this->message_die." : ".$this->file_name);
                if ( ($this->length_file != false ) && is_numeric($this->length_file))
                {
                  return fgets($file,$this->length_file);
                }
                else
                {
                  return fgets($file);
                }
                fclose($file);
            }
            else
            {
              return false;
            }
        }

        public function setLength($value)
        {
          if (is_numeric($value))
          {
            $this->length_file = $value;
          }
        }
   }