protected _persist method in Persister subclass File

gistfile1.aw

<?php

// interesting bits

protected function _persist()
{
	$this->_location = tempnam(sys_get_temp_dir(), 'UL-');

	if (!$this->_moveUploadedFile()) {
		unlink($this->_location);
		$this->_location = null;
		throw new \Exception('error moving uploaded file');
	}
}

// interesting bits