twig - pass function into template

Question

Currently I place my function in a class and pass an instance of this class into template and call my required function as a class method.

{{ unneededclass.blah(         


        

Answer 1

Although you cannot PHP callable directly, twig is extensible. You can add a callable filter, so you can apply to PHP functions passed to template.

namespace My\Twig\Extension;

class LambdaFilter extends \Twig_Extension {

    public function getName() {
        return 'lambda_filter';
    }

    public function getFilters() {
        return array(
            new \Twig_SimpleFilter('call', array($this, 'doCall'))
        );
    }

    public function doCall() {
        $arguments = func_get_args();
        $callable = array_shift($arguments);
        if(!is_callable($callable)) {
            throw new InvalidArgumentException();
        }
        return call_user_func_array($callable, $arguments);
    }

}

Now if you pass variable my_func to template, you can do my_func|call(arg1, arg2). You can even do higher order functions "array_filter"|call(my_array, my_func) and you can always do more things in filter like accepting array as parameters and so on.