我正在使用树枝,我试图添加一个功能。
$Func = new \Twig_SimpleFunction('placeholder', function ($title) {
$this->module->CurrentPage->addPlaceholder($title);
});
\App::make('twig')->addFunction($Func);
我会得到以下异常
Unable to add function "placeholder" as extensions have already been initialized.
我已经两次检查了" addFunction"在twig" loadTemplate"之前执行。所以,它似乎不是问题。
有没有人有这个暗示或想法?或者它的全部意义。 提前谢谢。
答案 0 :(得分:3)
您需要在创建Twig_Environment实例后立即添加twig函数。例如,以下内容不起作用:
$loader = new Twig_Loader_Filesystem($this->resourceRoot . '/views');
$twig = new Twig_Environment($loader, array(
'cache' => storage_path('twig'),
'debug' => Config::get('app.debug'),
'strict_variables' => true,
));
$lexer = new Twig_Lexer($twig, array(
'tag_comment' => array('{#', '#}'),
'tag_block' => array('{%', '%}'),
'tag_variable' => array('{^', '^}'),
'interpolation' => array('#{', '}'),
));
$twig->setLexer($lexer);
$function = new Twig_SimpleFunction('widget', function ($widget, array $params) {
WidgetFactory::renderWidget($widget, $params);
});
$twig->addFunction($function);
因为在添加函数之前初始化了Lexer。你需要这样做:
$loader = new Twig_Loader_Filesystem($this->resourceRoot . '/views');
$twig = new Twig_Environment($loader, array(
'cache' => storage_path('twig'),
'debug' => Config::get('app.debug'),
'strict_variables' => true,
));
$function = new Twig_SimpleFunction('widget', function ($widget, array $params) {
WidgetFactory::renderWidget($widget, $params);
});
$twig->addFunction($function);
$lexer = new Twig_Lexer($twig, array(
'tag_comment' => array('{#', '#}'),
'tag_block' => array('{%', '%}'),
'tag_variable' => array('{^', '^}'),
'interpolation' => array('#{', '}'),
));
$twig->setLexer($lexer);