使用Redmine的PHP API时，如何判断需求是否为原子需求

使用Redmine的PHP API时，如何判断需求是否为原子需求

/**
* 判断是否为原子需求, 即是否依然含有子需求
* @param int $id 需求Id
* @return int
*/
public function hasChildIssue($id)
{
$res = $this->client->api('issue')->show($id, array('include' => 'children'));
if (!empty($res) && isset($res['issue']['children'])) {
return true;
}
return false;
}

set_time_limit(0);
$startTime = microtime(true);

//检查API KEY是否配置
$configService = $this->serviceInstance('config', 'work');
$config = $configService->getConstApiKey();
if (empty($config)) {
throw new \Exception('固定API KEY未配置');
}
$constApiKey = $config['value'];
$redmine = new RedmineLib($constApiKey);

$issueId=17252;
$temp = $redmine->client->get('/issues/'.urlencode($issueId).'.json?'.http_build_query(array ('include' => 'children')));

$temp = $redmine->client->api('issue')->show(17252, array ('include' => 'children'));

var_dump($temp['issue']['children']); exit; // 如果有子任务，['issue']['children']字段不存在，否则['issue']['children']字段对应一个子数组

//        $temp  = $redmine->client->issue->show(17252, array('include' => 'children'));
//        $temp  = $redmine->hasChildIssue(17330);
var_dump($temp); exit;