php - Acces legacy class from twig view -

we re-writing part of web portal , need bitwise compare in twig view. have value(integer) in view passed controller , need make decision on image display. used bitwise compare against values in class somewhere in /opt folder.

i can bitwise (b-and) compare in twig how access legacy php class comparison?

within twig template don't have access regular php methods. so, include legacy class, need write custom function , twig extension. here example:

class stepoutextension extends \twig_extension {     public function getfunctions()     {         return array(             'inspect' => new \twig_function_method($this, 'step_out', array('needs_context' => true))         );     }     public function stepout($context)     {         // access class here     }     public function getname()     {         return 'legacy_class';     } } 

and register service:

services:     my_namespace.step_out:         class: acme\demobundle\extensions\stepoutextension         tags:           - { name: twig.extension } 

within twig can call new function

{{ step_out() }} 

more details can found in symfony docs.