Symfony2 - checking if file exists

Question

I have a loop in Twig template, which returns multiple values. Most important - an ID of my entry. When I didn\'t use any framework nor template engine, I used simply

Answer 1

If you want want to check the existence of a file which is not a twig template (so defined can't work), create a TwigExtension service and add file_exists() function to twig:

src/AppBundle/Twig/Extension/TwigExtension.php

Register your service:

src/AppBundle/Resources/config/services.yml

# ...

parameters:

    app.file.twig.extension.class: AppBundle\Twig\Extension\FileExtension

services:

    app.file.twig.extension:
        class: %app.file.twig.extension.class%
        tags:
            - { name: twig.extension }

That's it, now you are able to use file_exists() inside a twig template ;)

Some template.twig:

{% if file_exists('/home/sybio/www/website/picture.jpg') %}
    The picture exists !
{% else %}
    Nope, Chuck testa !
{% endif %}

EDIT to answer your comment:

To use file_exists(), you need to specify the absolute path of the file, so you need the web directory absolute path, to do this give access to the webpath in your twig templates app/config/config.yml:

# ...

twig:
    globals:
        web_path: %web_path%

parameters:
    web_path: %kernel.root_dir%/../web

Now you can get the full physical path to the file inside a twig template:

{# Display: /home/sybio/www/website/web/img/games/3.jpg #}
{{ web_path~asset('img/games/'~item.getGame.id~'.jpg') }}

So you'll be able to check if the file exists:

{% if file_exists(web_path~asset('img/games/'~item.getGame.id~'.jpg')) %}