How to Call Static Function In Symfony2 Twig Template

Question

How to call my static function in twig template without passing through controller?

For example:

...
{{ MyStaticClass::getData() }}
...

My Static Class:

class MyStaticClass {
    const v1 = 'Value1';
    const v2 = 'Value2';
    ...

    public static function getData() {
        ...

        return $data;
    }
}

Answer 1

A generic approach is to register a Twig helper function named callstatic to make the call.

$twig->addFunction(new \Twig_SimpleFunction('callstatic', function ($class, $method, ...$args) {
    if (!class_exists($class)) {
        throw new \Exception("Cannot call static method $method on Class $class: Invalid Class");
    }

    if (!method_exists($class, $method)) {
        throw new \Exception("Cannot call static method $method on Class $class: Invalid method");
    }

    return forward_static_call_array([$class, $method], $args);
}));

The main advantage of this approach is that it will work with any class and method combination.

Usage:

{# This will call \Mynamespace\Mypackage\Myclass::getStuff(); #}
{% set result = callstatic('\\Mynamespace\\Mypackage\\Myclass', 'getStuff') %}

It also supports arguments:

{# This will call \Mynamespace\Mypackage\Myclass::getStuff('arg1', 'arg2'); #}
{% set result = callstatic('\\Mynamespace\\Mypackage\\Myclass', 'getStuff', 'arg1', 'arg2') %}

Answer 2

Instead of writing a Twig extension an easier / less bloated solution can sometimes be to simply pass a new instance of the class with the static methods to twig.

eg

// ...
$viewVars['MyStaticClass'] = new MyStaticClass();
// ...
$html = $twig->render('myTemplate.html.twig', $viewVars);

and in twig:

{{ MyStaticClass.getData() }}