我在从SF2.0.x迁移到SF2.7的应用程序中收到此错误：
[1] Symfony\Component\Debug\Exception\FatalErrorException: Compile Error: Cannot use isset() on the result of an expression (you can use "null !== expression" instead)
at n/a
in /var/www/html/reptooln_admin/app/cache/dev/twig/68/7f/63589dd3687cb849dd68e6b6c10aa99eda1d82f95a5f3ac52a864d200499.PHP line 39
我不知道什么是失败或如何解决这个问题所以我需要一些建议.这是报告Stacktrace的缓存文件中的行：
if ((((empty((isset($context["form_action"]) ? $context["form_action"] : $this->getContext($context,"form_action"))) == true) || (isnull((isset($context["form_action"]) ? $context["form_action"] : $this->getContext($context,"form_action"))) == true)) || (isset((isset($context["form_action"]) ? $context["form_action"] : $this->getContext($context,"form_action"))) == false))) {
echo " ";
$context["form_action"] = "";
echo " ";
我有这个TwigExtension：
class PDOneTwigExtension extends \Twig_Extension
{
public function getFilters()
{
return array(
'var_dump' => new \Twig_Filter_Function('var_dump'),'empty' => new \Twig_Filter_Function('empty',array($this,'is_empty')),'isset' => new \Twig_Filter_Function('isset','is_set')),'isnull' => new \Twig_Filter_Function('isnull','is_null')),'ucfirst' => new \Twig_Filter_Function('ucfirst','uc_first')),'ucwords' => new \Twig_Filter_Function('ucwords','uc_words')),'count' => new \Twig_Filter_Function('count','co_unt')),'sizeof' => new \Twig_Filter_Function('sizeof','size_of')),'concat' => new \Twig_Filter_Function('concat','concat')),'in_array' => new \Twig_Filter_Function('in_array','inarray')),'array' => new \Twig_Filter_Function('array','array_')),'add_to_array' => new \Twig_Filter_Function('add_to_array','add_to_array')),'replace' => new \Twig_Filter_Function('replace','replace')),'htmlentitydecode' => new \Twig_Filter_Function('htmlentitydecode','htmlentitydecode'))
);
}
public function is_empty($sentence)
{
return empty($sentence) ? true : false;
}
// rest of methods goes here
public function getName()
{
return 'pdone_twig_extension';
}
}
我在模板上使用如下：
{% if form_action|empty == true or form_action|isnull == true or form_action|isset == false %} {% set form_action = '' %} {% endif %}
问题出在哪里？有什么建议？
从
documentation开始：
isset() only works with variables as passing anything else will result in a parse error.
您没有直接将变量传递给isset().因此,您需要首先计算该值,将其分配给变量,然后将其传递给isset().
例如,您目前正在做的事情如下：
if(isset($something === false)) { } // throws a parse error,because $something === false is not a variable
你需要做的是：
$something = false;
if(isset($something)) { ... }
