How to change the title of page dynamically with symfony2

My solution looks a bit more elegant in the child-templates:

In your layout.html.twig:

<title>{% if page_title is defined %} {{ page_title }} | {% endif %} Your Website</title>

In your child page-templates:

{% extends '::layout.html.twig' %}

{% set page_title = 'Your page-title' %}

{# Put the rest of your page below #}

And you can also reuse the title in eg. an doing <h1>{{ page_title }}</h1> :-)

You are close. In your news.html.twig I assume you have all of your content in a block like this:

{% extends '::layout.html.twig' %}

{% block content %}
    content of the news page here
{% endblock %}`

So all you have to do is add another block for the title outside of that content block

{% extends '::layout.html.twig' %}

{% block title %}Title of news page{% endblock %}

{% block content %}
    content of the news page here
{% endblock %}`

Is more simple that you imagine.

Put on main/parent layout

...
<title>{% block title %}{% endblock %} - My Site</title>
...

and, in a content page ( on child layout ), get the page title

...
<h1>{{ block('title') }}</h1>
...

So, any title that you put in head title will be displayed in the content title.