clone entity with file (assume upload function is called with lifecycle)

SymfonyEntityCloneMethod.php

    public function __clone() {
        $this->id = null;

        if (!is_null($this->filename)){

            $temp_file = tempnam(ini_get('upload_tmp_dir'), sha1(uniqid(mt_rand(), true)));

            $file = new File($this->getAbsolutePath());

            copy($this->getAbsolutePath(), $temp_file);
            $up_file = new UploadedFile($temp_file, $this->filename, $file->getMimeType(), $file->getSize(), UPLOAD_ERR_OK, true);

            $this->setFile($up_file);
        }

        unset($this->_entityPersister, $this->_identifier);
    }