Twig Extensions Defined by Symfony

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Twig Extensions Defined by Symfony

Twig is the template engine used in Symfony applications. There are tens of default filters and functions defined by Twig, but Symfony also defines some filters, functions and tags to integrate the various Symfony components with Twig templates. This article explains them all.

Tip

If these extensions provided by Symfony are not enough, you can create a custom Twig extension to define even more filters and functions.

Functions

render

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        {{ render(uri, options = []) }}
    

uri: type: string | ControllerReference
options (optional): type: array default: []

Makes a request to the given internal URI or controller and returns the result. The render strategy can be specified in the strategy key of the options. It's commonly used to embed controllers in templates.

render_esi

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        {{ render_esi(uri, options = []) }}
    

uri: type: string | ControllerReference
options (optional): type: array default: []

It's similar to the render function and defines the same arguments. However, it generates an ESI tag when ESI support is enabled or falls back to the behavior of render otherwise.

Tip

The render_esi() function is an example of the shortcut functions of render. It automatically sets the strategy based on what's given in the function name, e.g. render_hinclude() will use the hinclude.js strategy. This works for all render_*() functions.

fragment_uri

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        {{ fragment_uri(controller, absolute = false, strict = true, sign = true) }}
    

controller: type: ControllerReference
absolute (optional): type: boolean default: false
strict (optional): type: boolean default: true
sign (optional): type: boolean default: true

Generates the URI of a fragment.

controller

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        {{ controller(controller, attributes = [], query = []) }}
    

controller: type: string
attributes (optional): type: array default: []
query (optional): type: array default: []

Returns an instance of ControllerReference to be used with functions like render() and render_esi().

asset

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        {{ asset(path, packageName = null) }}
    

path: type: string
packageName (optional): type: string | null default: null

Returns the public path of the given asset path (which can be a CSS file, a JavaScript file, an image path, etc.). This function takes into account where the application is installed (e.g. in case the project is accessed in a host subdirectory) and the optional asset package base path.

Symfony provides various cache busting implementations via the Framework Configuration Reference (FrameworkBundle), Framework Configuration Reference (FrameworkBundle), and Framework Configuration Reference (FrameworkBundle) configuration options.

asset_version

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        {{ asset_version(packageName = null) }}
    

packageName (optional): type: string | null default: null

Returns the current version of the package, more information in Creating and Using Templates.

csrf_token

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        {{ csrf_token(intention) }}
    

intention: type: string - an arbitrary string used to identify the token.

Renders a CSRF token. Use this function if you want CSRF protection in a regular HTML form not managed by the Symfony Form component.

is_granted

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        {{ is_granted(role, object = null, field = null) }}
    

role: type: string
object (optional): type: object
field (optional): type: string

Returns true if the current user has the given role.

Optionally, an object can be passed to be used by the voter. More information can be found in Security.

logout_path

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        {{ logout_path(key = null) }}
    

key (optional): type: string

Generates a relative logout URL for the given firewall. If no key is provided, the URL is generated for the current firewall the user is logged into.

logout_url

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        {{ logout_url(key = null) }}
    

key (optional): type: string

Equal to the logout_path function, but it'll generate an absolute URL instead of a relative one.

path

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        {{ path(route_name, route_parameters = [], relative = false) }}
    

name: type: string
parameters (optional): type: array default: []
relative (optional): type: boolean default: false

Returns the relative URL (without the scheme and host) for the given route. If relative is enabled, it'll create a path relative to the current path.

url

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        {{ url(route_name, route_parameters = [], schemeRelative = false) }}
    

name: type: string
parameters (optional): type: array default: []
schemeRelative (optional): type: boolean default: false

Returns the absolute URL (with scheme and host) for the given route. If schemeRelative is enabled, it'll create a scheme-relative URL.

absolute_url

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        {{ absolute_url(path) }}
    

path: type: string

Returns the absolute URL (with scheme and host) from the passed relative path. Combine it with the asset() function to generate absolute URLs for web assets. Read more about Linking to CSS, JavaScript and Image Assets.

relative_path

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        {{ relative_path(path) }}
    

path: type: string

Returns the relative path from the passed absolute URL. For example, assume you're on the following page in your app: http://example.com/products/hover-board.

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        {{ relative_path('http://example.com/human.txt') }}
{# ../human.txt #}

{{ relative_path('http://example.com/products/products_icon.png') }}
{# products_icon.png #}
    

expression

Creates an Expression related to the ExpressionLanguage component.

impersonation_exit_path

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        {{ impersonation_exit_path(exitTo = null) }}
    

exitTo (optional): type: string

Generates a URL that you can visit to exit user impersonation. After exiting impersonation, the user is redirected to the current URI. If you prefer to redirect to a different URI, define its value in the exitTo argument.

If no user is being impersonated, the function returns an empty string.

impersonation_exit_url

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        {{ impersonation_exit_url(exitTo = null) }}
    

exitTo (optional): type: string

It's similar to the impersonation_exit_path function, but it generates absolute URLs instead of relative URLs.

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        {{ t(message, parameters = [], domain = 'messages')|trans }}
    

message: type: string
parameters (optional): type: array default: []
domain (optional): type: string default: messages

Creates a Translatable object that can be passed to the trans filter.

The following functions related to Symfony Forms are also available. They are explained in the article about customizing form rendering:

Filters

humanize

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        {{ text|humanize }}
    

text: type: string

Makes a technical name human readable (i.e. replaces underscores by spaces or transforms camelCase text like helloWorld to hello world and then capitalizes the string).

trans

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        {{ message|trans(arguments = [], domain = null, locale = null) }}
    

message: type: string | Translatable
arguments (optional): type: array default: []
domain (optional): type: string default: null
locale (optional): type: string default: null

Translates the text into the current language. More information in Translation Filters.

yaml_encode

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        {{ input|yaml_encode(inline = 0, dumpObjects = false) }}
    

input: type: mixed
inline (optional): type: integer default: 0
dumpObjects (optional): type: boolean default: false

Transforms the input into YAML syntax. See The Yaml Component for more information.

yaml_dump

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        {{ value|yaml_dump(inline = 0, dumpObjects = false) }}
    

value: type: mixed
inline (optional): type: integer default: 0
dumpObjects (optional): type: boolean default: false

Does the same as yaml_encode(), but includes the type in the output.

abbr_class

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        {{ class|abbr_class }}
    

class: type: string

Generates an <abbr> element with the short name of a PHP class (the FQCN will be shown in a tooltip when a user hovers over the element).

abbr_method

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        {{ method|abbr_method }}
    

method: type: string

Generates an <abbr> element using the FQCN::method() syntax. If method is Closure, Closure will be used instead and if method doesn't have a class name, it's shown as a function (method()).

format_args

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        {{ args|format_args }}
    

args: type: array

Generates a string with the arguments and their types (within <em> elements).

format_args_as_text

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        {{ args|format_args_as_text }}
    

args: type: array

Equal to the format_args filter, but without using HTML tags.

file_excerpt

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        {{ file|file_excerpt(line, srcContext = 3) }}
    

file: type: string
line: type: integer
srcContext (optional): type: integer

Generates an excerpt of a code file around the given line number. The srcContext argument defines the total number of lines to display around the given line number (use -1 to display the whole file).

format_file

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        {{ file|format_file(line, text = null) }}
    

file: type: string
line: type: integer
text (optional): type: string default: null

Generates the file path inside an <a> element. If the path is inside the kernel root directory, the kernel root directory path is replaced by kernel.project_dir (showing the full path in a tooltip on hover).

format_file_from_text

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        {{ text|format_file_from_text }}
    

text: type: string

Uses format_file to improve the output of default PHP errors.

file_link

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        {{ file|file_link(line) }}
    

file: type: string
line: type: integer

Generates a link to the provided file and line number using a preconfigured scheme.

file_relative

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        {{ file|file_relative }}
    

file: type: string

It transforms the given absolute file path into a new file path relative to project's root directory:

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        {{ '/var/www/blog/templates/admin/index.html.twig'|file_relative }}
{# if project root dir is '/var/www/blog/', it returns 'templates/admin/index.html.twig' #}
    

If the given file path is out of the project directory, a null value will be returned.

serialize

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        {{ object|serialize(format = 'json', context = []) }}
    

object: type: mixed
format (optional): type: string
context (optional): type: array

Accepts any data that can be serialized by the Serializer component and returns a serialized string in the specified format.

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