auto_reload

type: boolean default: %kernel.debug%

If true, whenever a template is rendered, Symfony checks first if its source code has changed since it was compiled. If it has changed, the template is compiled again automatically.

autoescape

type: boolean or string default: 'name'

If set to false, automatic escaping is disabled (you can still escape each content individually in the templates).

If set to a string, the template contents are escaped using the strategy with that name. Allowed values are html, js, css, url, html_attr and name. The default value is name. This strategy escapes contents according to the template name extension (e.g. it uses html for *.html.twig templates and js for *.js.twig templates).

autoescape_service

type: string default: null

The escaping strategy applied by default to the template is determined during compilation time based on the filename of the template. This means for example that the contents of a *.html.twig template are escaped for HTML and the contents of *.js.twig are escaped for JavaScript.

This option allows to define the Symfony service which will be used to determine the default escaping applied to the template.

autoescape_service_method

type: string default: null

If autoescape_service option is defined, then this option defines the method called to determine the default escaping applied to the template.

base_template_class

type: string default: 'Twig\Template'

Twig templates are compiled into PHP classes before using them to render contents. This option defines the base class from which all the template classes extend. Using a custom base template is discouraged because it will make your application harder to maintain.

cache

type: string | false default: '%kernel.cache_dir%/twig'

Before using the Twig templates to render some contents, they are compiled into regular PHP code. Compilation is a costly process, so the result is cached in the directory defined by this configuration option.

Set this option to false to disable Twig template compilation. However, this is not recommended; not even in the dev environment, because the auto_reload option ensures that cached templates which have changed get compiled again.

charset

type: string default: '%kernel.charset%'

The charset used by the template files. By default it's the same as the value of the kernel.charset container parameter, which is UTF-8 by default in Symfony applications.

date

These options define the default values used by the date filter to format date and time values. They are useful to avoid passing the same arguments on every date filter call.

debug

type: boolean default: %kernel.debug%

If true, the compiled templates include a __toString() method that can be used to display their nodes.

default_path

type: string default: '%kernel.project_dir%/templates'

The path to the directory where Symfony will look for the application Twig templates by default. If you store the templates in more than one directory, use the paths option too.

form_themes

type: array of string default: ['form_div_layout.html.twig']

Defines one or more form themes which are applied to all the forms of the application:

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# config/packages/twig.yaml
twig:
    form_themes: ['bootstrap_5_layout.html.twig', 'form/my_theme.html.twig']
    # ...

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<!-- config/packages/twig.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:twig="http://symfony.com/schema/dic/twig"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/twig https://symfony.com/schema/dic/twig/twig-1.0.xsd">

    <twig:config>
        <twig:form-theme>bootstrap_5_layout.html.twig</twig:form-theme>
        <twig:form-theme>form/my_theme.html.twig</twig:form-theme>
        <!-- ... -->
    </twig:config>
</container>

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// config/packages/twig.php
use Symfony\Config\TwigConfig;

return static function (TwigConfig $twig) {
    $twig->formThemes([
        'bootstrap_5_layout.html.twig',
        'form/my_theme.html.twig',
    ]);

    // ...
};

The order in which themes are defined is important because each theme overrides all the previous one. When rendering a form field whose block is not defined in the form theme, Symfony falls back to the previous themes until the first one.

These global themes are applied to all forms, even those which use the form_theme Twig tag, but you can disable global themes for specific forms.

globals

type: array default: []

It defines the global variables injected automatically into all Twig templates. Learn more about Twig global variables.

number_format

These options define the default values used by the number_format filter to format numeric values. They are useful to avoid passing the same arguments on every number_format filter call.

optimizations

type: integer default: -1

Twig includes an extension called optimizer which is enabled by default in Symfony applications. This extension analyzes the templates to optimize them when being compiled. For example, if your template doesn't use the special loop variable inside a for tag, this extension removes the initialization of that unused variable.

By default, this option is -1, which means that all optimizations are turned on. Set it to 0 to disable all the optimizations. You can even enable or disable these optimizations selectively, as explained in the Twig documentation about the optimizer extension.

paths

type: array default: null

Defines the directories where application templates are stored in addition to the directory defined in the default_path option:

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# config/packages/twig.yaml
twig:
    # ...
    paths:
        'email/default/templates': ~
        'backend/templates': 'admin'

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<!-- config/packages/twig.xml -->
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:twig="http://symfony.com/schema/dic/twig"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/twig https://symfony.com/schema/dic/twig/twig-1.0.xsd">

    <twig:config>
        <!-- ... -->
        <twig:path>email/default/templates</twig:path>
        <twig:path namespace="admin">backend/templates</twig:path>
    </twig:config>
</container>

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// config/packages/twig.php
use Symfony\Config\TwigConfig;

return static function (TwigConfig $twig) {
    // ...

    $twig->path('email/default/templates', null);
    $twig->path('backend/templates', 'admin');
};

Read more about template directories and namespaces.

strict_variables

type: boolean default: %kernel.debug%

If set to true, Symfony shows an exception whenever a Twig variable, attribute or method doesn't exist. If set to false these errors are ignored and the non-existing values are replaced by null.