APACHE-PHP致命错误:Can'；t在写入上下文中使用方法返回值 - APACHE - PHP Fatal error: Can't use method return value in write context

APACHE - PHP Fatal error: Can't use method return value in write context

因此，当我在基于CentOS的Apache web服务器上部署时，试图访问我的测试站点时，会出现此错误：

Fatal error: Can't use method return value in write context in /var/www/betadmin/src/AdminBundle/Twig/WidgetTwigExtension.php on line 234

第234行包含以下内容：

 if(empty($session->get('currency'))) {

这是整个代码：

public function get_default_currency()
{
    $session = new Session();
    if(empty($session->get('currency'))) {
        $currency = $this->currencyService->findOneByDefault();
        if(!$currency instanceof Currency) {
            $currency = $this->currencyService->findOneByName('EURO');
            if(!$currency instanceof Currency) {
                $currency = $this->currencyService->findOneByActive();
                if(!$currency instanceof Currency) {
                    $currency = $this->currencyService->findOneByInactive();
                    if(!$currency instanceof Currency) {
                        //$currency = array ('currency' => 'None');
                        return 'None';
                    }
                }
            }
        }
        $session->set('currency', $currency);
    }
   return $session->get('currency');
}

事实上，空函数不接受直接计算函数返回值。Empty（）不是语言的函数，而是一种语言构造。

尝试：

public function get_default_currency()
{
    $session = new Session();
    $ret = $session->get('currency');
    if(empty($ret)) {
        $currency = $this->currencyService->findOneByDefault();
        if(!$currency instanceof Currency) {
            $currency = $this->currencyService->findOneByName('EURO');
            if(!$currency instanceof Currency) {
                $currency = $this->currencyService->findOneByActive();
            if(!$currency instanceof Currency) {
                $currency = $this->currencyService->findOneByInactive();
                if(!$currency instanceof Currency) {
                    //$currency = array ('currency' => 'None');
                    return 'None';
                }
            }
        }
    }
    $session->set('currency', $currency);
}
   return $session->get('currency');
}