How to obtain global variables in twig template

The example in this article describes how to obtain global variables in twig template. Share it with everyone for your reference, the details are as follows:

A brief introduction, twig is a template engine that can simplify the writing process of PHP and improve efficiency.

The Symfony template comes with the twig template engine.

Twig has many syntaxes, there are only three types, which are relatively easy

1. {{..}}, this represents the output variable in twig, for example:

{{ id }}

2, {%...%}, this in twig represents judgment , for example (taken from twig official document example):

Judge whether the value is true:

{% if online == false %}
  <p>Our website is in maintenance mode. Please, come back later.</p>
{%endif%}

Judge whether the value is true Is empty:

{% if users %}
  <ul>
   {% for user in users %}
    <li>{{ user.username|e }}</li>
   {% endfor %}
  </ul>
{% endif %}

Determine whether this value can be found:

{% if users is defined %}
  <li>{{ user.username|e }}</li>
{% endif %}

3. {#...#}, the meaning of this comment

The general syntax is introduced, and then there is how to output it with twig Global variables.
I searched for a long time but couldn’t find it. Finally I found it through the wall. The code below

{{ app.session.get('varname') }}

The varname above is the name of the corresponding value in the session array that needs to be output.

I am still continuing to learn the template engine twig. Corrections and additions are welcome.

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Readers who are interested in more content related to PHP templates can check out the special topics of this site: "Summary of PHP Template Technology", "Basic Tutorial for Getting Started with Smarty Templates", "Introductory Tutorial for Codeigniter" and "Introductory Tutorial for ThinkPHP"

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