job.php

class WhampoaJobStatus
{
  const STATUS_COMPLETED = 'completed';
	const STATUS_FAILED = 'failed';

	private $doc;

	public function loadFromXML($source)
	{
		$this->doc = new DOMDocument();
		$this->doc->loadXML($source);
	}

	public function getStatus()
	{
		$xp = new DOMXPath($this->doc);

		if (($status = $xp->query('/jobStatus/status')->item(0)) === null) {
			throw new Exception("Could not determine status");
		}

		return trim($status->textContent);
	}
}