Duplicating writing in php file

Question

I am implementing a Fileimpl class that contains a write method. However, at the time I write, it seems that the request is duplicated. That is, if I try to add 1 date, as in the example below...

$file = new FileImpl('log.txt');
$file->write(date('d/m/Y H:i:s'));

I have this result in my file writing output:

Output example:

16/04/2019 04:47:58
16/04/2019 04:47:58
16/04/2019 04:54:55
16/04/2019 04:54:55

I really don’t know where the bug is. See the implementation of my class:

class FileImpl {

  private $diretory;
  private $fileName;

  public function __construct(string $fileName, string $directory = NULL) {
    $this->fileName = $fileName;
    if ($directory != NULL)
      $this->diretory = $directory . date('dMY');
  }

  public function write($data) : void {
    if (!$this->diretory) {
      $file = fopen($this->fileName, 'a+');
      echo "Arquivo criado sem diretorio\n";
    } else {
        if (!is_dir($this->diretory)) {
          mkdir($this->diretory);
        }
        $file = fopen($this->diretory . DIRECTORY_SEPARATOR . $this->fileName, 'a+');
        echo "Arquivo criado com diretorio\n";
    }
    fwrite($file, $data."\r\n");
    fclose($file);
  }

}