Creating dynamic Twig template inside the PHP Controller with Symfony

Question

To explain my needs :

I want my users to create by themselves a "twig template" with Google Docs
For example, if inside my user's GDocs there is {% if user.id is defind %}{{ user.name }}{% endif %}
I want, in my Controller, to get this string ("{% if user.id is defind %}{{ user.name }}{% endif %}")
Then check if this particular Twig string can be interpreted
If yes, get the real value of that twig string (let's say "John")
And then, in a the GDocs of my user, replace "{% if user.id is defind %}{{ user.name }}{% endif %}" by "John"

I absolutely need to get the final value ("John"), because GDocs just gives a method to search and replace a string (search "{% if user.id is defind %}{{ user.name }}{% endif %}", replace by "John").

So...

For each twig string that I find in their GDocs, I need to test if I can find a value for this twig.

Is there a way to "create" a twig in my Controller, replace its value by something like this ?

$myTwig = new TwigTemplate("{% if user.id is defind %}{{ user.name }}{% endif %}");
$myUserName = $this->render($myTwig, array("user" => $user")

Thank you in advance !

You can sort of do this with what is known as a Twig ArrayLoader. One problem is that twig templates are "compiled" into php and then cached for performance issues. So if you try doing something like this in production then you need to be careful about your cache. — Cerad
– Cerad, Commented Feb 7, 2020 at 14:50
Thank you @Cerad, i'll look that way for now, if there's no better solution yet! — Tibo
– Tibo, Commented Feb 7, 2020 at 15:17

Cid · Accepted Answer · 2020-02-07 14:54:36Z

1

You can use template_from_string() in twig to eval a string as twig code :

$myTwig = "{% if user.id is defind %}{{ user.name }}{% endif %}";
// $template can be the base template in which you inject the code
$myUserName = $this->render($template, array('myTwig' => $myTwig, "user" => $user");

In the view :

{{ include(template_from_string(myTwig)) }}

1 Comment

Tibo Over a year ago

Thank you for your aswer ! I don't really to render any view ! I just want to know if the twig string is valid, get the value and pass it to Google API :) ! Next step after this is to send a request to Google so it replaces the twig string in their GDocs

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