Creating and Sending Notifications

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Read the updated version of this page for Symfony 7.1 (the current stable version).

Installation

Current web applications use many different channels to send messages to the users (e.g. SMS, Slack messages, emails, push notifications, etc.). The Notifier component in Symfony is an abstraction on top of all these channels. It provides a dynamic way to manage how the messages are sent. Get the Notifier installed using:

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        $ composer require symfony/notifier
    

Channels: Chatters, Texters, Email, Browser and Push

The notifier component can send notifications to different channels. Each channel can integrate with different providers (e.g. Slack or Twilio SMS) by using transports.

The notifier component supports the following channels:

SMS channel sends notifications to phones via SMS messages;
Chat channel sends notifications to chat services like Slack and Telegram;
Email channel integrates the Symfony Mailer;
Browser channel uses flash messages.
Push channel sends notifications to phones and browsers via push notifications.

Tip

Use secrets to securely store your API tokens.

SMS Channel

Caution

If any of the DSN values contains any character considered special in a URI (such as : / ? # [ ] @ ! $ & ' ( ) * + , ; =), you must encode them. See RFC 3986 for the full list of reserved characters or use the urlencode function to encode them.

The SMS channel uses Texter classes to send SMS messages to mobile phones. This feature requires subscribing to a third-party service that sends SMS messages. Symfony provides integration with a couple popular SMS services:

Service
46elks	Install: `composer require symfony/forty-six-elks-notifier` DSN: `forty-six-elks://API_USERNAME:API_PASSWORD@default?from=FROM` Webhook support: No
AllMySms	Install: `composer require symfony/all-my-sms-notifier` DSN: `allmysms://LOGIN:APIKEY@default?from=FROM` Webhook support: No
AmazonSns	Install: `composer require symfony/amazon-sns-notifier` DSN: `sns://ACCESS_KEY:SECRET_KEY@default?region=REGION` Webhook support: No
Bandwidth	Install: `composer require symfony/bandwidth-notifier` DSN: `bandwidth://USERNAME:PASSWORD@default?from=FROM&account_id=ACCOUNT_ID&application_id=APPLICATION_ID&priority=PRIORITY` Webhook support: No
Brevo	Install: `composer require symfony/brevo-notifier` DSN: `brevo://API_KEY@default?sender=SENDER` Webhook support: No
Clickatell	Install: `composer require symfony/clickatell-notifier` DSN: `clickatell://ACCESS_TOKEN@default?from=FROM` Webhook support: No
ContactEveryone	Install: `composer require symfony/contact-everyone-notifier` DSN: `contact-everyone://TOKEN@default?&diffusionname=DIFFUSION_NAME&category=CATEGORY` Webhook support: No
Esendex	Install: `composer require symfony/esendex-notifier` DSN: `esendex://USER_NAME:PASSWORD@default?accountreference=ACCOUNT_REFERENCE&from=FROM` Webhook support: No
FakeSms	Install: `composer require symfony/fake-sms-notifier` DSN: `fakesms+email://MAILER_SERVICE_ID?to=TO&from=FROM` or `fakesms+logger://default` Webhook support: No
FreeMobile	Install: `composer require symfony/free-mobile-notifier` DSN: `freemobile://LOGIN:API_KEY@default?phone=PHONE` Webhook support: No
GatewayApi	Install: `composer require symfony/gateway-api-notifier` DSN: `gatewayapi://TOKEN@default?from=FROM` Webhook support: No
GoIP	Install: `composer require symfony/go-ip-notifier` DSN: `goip://USERNAME:PASSWORD@HOST:80?sim_slot=SIM_SLOT` Webhook support: No
Infobip	Install: `composer require symfony/infobip-notifier` DSN: `infobip://AUTH_TOKEN@HOST?from=FROM` Webhook support: No
Iqsms	Install: `composer require symfony/iqsms-notifier` DSN: `iqsms://LOGIN:PASSWORD@default?from=FROM` Webhook support: No
iSendPro	Install: `composer require symfony/isendpro-notifier` DSN: `isendpro://ACCOUNT_KEY_ID@default?from=FROM&no_stop=NO_STOP&sandbox=SANDBOX` Webhook support: No
KazInfoTeh	Install: `composer require symfony/kaz-info-teh-notifier` DSN: `kaz-info-teh://USERNAME:PASSWORD@default?sender=FROM` Webhook support: No
LightSms	Install: `composer require symfony/light-sms-notifier` DSN: `lightsms://LOGIN:TOKEN@default?from=PHONE` Webhook support: No
Mailjet	Install: `composer require symfony/mailjet-notifier` DSN: `mailjet://TOKEN@default?from=FROM` Webhook support: No
MessageBird	Install: `composer require symfony/message-bird-notifier` DSN: `messagebird://TOKEN@default?from=FROM` Webhook support: No
MessageMedia	Install: `composer require symfony/message-media-notifier` DSN: `messagemedia://API_KEY:API_SECRET@default?from=FROM` Webhook support: No
Mobyt	Install: `composer require symfony/mobyt-notifier` DSN: `mobyt://USER_KEY:ACCESS_TOKEN@default?from=FROM` Webhook support: No
Nexmo	Install: `composer require symfony/nexmo-notifier` Abandoned in favor of Vonage (see below)
Octopush	Install: `composer require symfony/octopush-notifier` DSN: `octopush://USERLOGIN:APIKEY@default?from=FROM&type=TYPE` Webhook support: No
OrangeSms	Install: `composer require symfony/orange-sms-notifier` DSN: `orange-sms://CLIENT_ID:CLIENT_SECRET@default?from=FROM&sender_name=SENDER_NAME` Webhook support: No
OvhCloud	Install: `composer require symfony/ovh-cloud-notifier` DSN: `ovhcloud://APPLICATION_KEY:APPLICATION_SECRET@default?consumer_key=CONSUMER_KEY&service_name=SERVICE_NAME` Webhook support: No
Plivo	Install: `composer require symfony/plivo-notifier` DSN: `plivo://AUTH_ID:AUTH_TOKEN@default?from=FROM` Webhook support: No
Redlink	Install: `composer require symfony/redlink-notifier` DSN: `redlink://API_KEY:APP_KEY@default?from=SENDER_NAME&version=API_VERSION` Webhook support: No
RingCentral	Install: `composer require symfony/ring-central-notifier` DSN: `ringcentral://API_TOKEN@default?from=FROM` Webhook support: No
Sendberry	Install: `composer require symfony/sendberry-notifier` DSN: `sendberry://USERNAME:PASSWORD@default?auth_key=AUTH_KEY&from=FROM` Webhook support: No
Sendinblue	Install: `composer require symfony/sendinblue-notifier` DSN: `sendinblue://API_KEY@default?sender=PHONE` Webhook support: No
Sms77	Install: `composer require symfony/sms77-notifier` DSN: `sms77://API_KEY@default?from=FROM` Webhook support: No
SimpleTextin	Install: `composer require symfony/simple-textin-notifier` DSN: `simpletextin://API_KEY@default?from=FROM` Webhook support: No
Sinch	Install: `composer require symfony/sinch-notifier` DSN: `sinch://ACCOUNT_ID:AUTH_TOKEN@default?from=FROM` Webhook support: No
Smsapi	Install: `composer require symfony/smsapi-notifier` DSN: `smsapi://TOKEN@default?from=FROM` Webhook support: No
SmsBiuras	Install: `composer require symfony/sms-biuras-notifier` DSN: `smsbiuras://UID:API_KEY@default?from=FROM&test_mode=0` Webhook support: No
Smsc	Install: `composer require symfony/smsc-notifier` DSN: `smsc://LOGIN:PASSWORD@default?from=FROM` Webhook support: No
SMSFactor	Install: `composer require symfony/sms-factor-notifier` DSN: `sms-factor://TOKEN@default?sender=SENDER&push_type=PUSH_TYPE` Webhook support: No
SpotHit	Install: `composer require symfony/spot-hit-notifier` DSN: `spothit://TOKEN@default?from=FROM` Webhook support: No
Telnyx	Install: `composer require symfony/telnyx-notifier` DSN: `telnyx://API_KEY@default?from=FROM&messaging_profile_id=MESSAGING_PROFILE_ID` Webhook support: No
TurboSms	Install: `composer require symfony/turbo-sms-notifier` DSN: `turbosms://AUTH_TOKEN@default?from=FROM` Webhook support: No
Twilio	Install: `composer require symfony/twilio-notifier` DSN: `twilio://SID:TOKEN@default?from=FROM` Webhook support: Yes
Vonage	Install: `composer require symfony/vonage-notifier` DSN: `vonage://KEY:SECRET@default?from=FROM` Webhook support: Yes
Yunpian	Install: `composer require symfony/yunpian-notifier` DSN: `yunpian://APIKEY@default` Webhook support: No

Tip

Some third party transports, when using the API, support status callbacks via webhooks. See the Webhook documentation for more details.

To enable a texter, add the correct DSN in your .env file and configure the texter_transports:

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        # .env
TWILIO_DSN=twilio://SID:TOKEN@default?from=FROM
    

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        # config/packages/notifier.yaml
framework:
    notifier:
        texter_transports:
            twilio: '%env(TWILIO_DSN)%'
    

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        <!-- config/packages/notifier.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:framework="http://symfony.com/schema/dic/symfony"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/symfony
        https://symfony.com/schema/dic/symfony/symfony-1.0.xsd">

    <framework:config>
        <framework:notifier>
            <framework:texter-transport name="twilio">
                %env(TWILIO_DSN)%
            </framework:texter-transport>
        </framework:notifier>
    </framework:config>
</container>
    

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        // config/packages/notifier.php
use Symfony\Config\FrameworkConfig;

return static function (FrameworkConfig $framework): void {
    $framework->notifier()
        ->texterTransport('twilio', env('TWILIO_DSN'))
    ;
};
    

The TexterInterface class allows you to send SMS messages:

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        // src/Controller/SecurityController.php
namespace App\Controller;

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Notifier\Message\SmsMessage;
use Symfony\Component\Notifier\TexterInterface;
use Symfony\Component\Routing\Attribute\Route;

class SecurityController
{
    #[Route('/login/success')]
    public function loginSuccess(TexterInterface $texter): Response
    {
        $options = (new ProviderOptions())
            ->setPriority('high')
        ;

        $sms = new SmsMessage(
            // the phone number to send the SMS message to
            '+1411111111',
            // the message
            'A new login was detected!',
            // optionally, you can override default "from" defined in transports
            '+1422222222',
            // you can also add options object implementing MessageOptionsInterface
            $options
        );

        $sentMessage = $texter->send($sms);

        // ...
    }
}
    

The send() method returns a variable of type SentMessage which provides information such as the message ID and the original message contents.

Chat Channel

Caution

The chat channel is used to send chat messages to users by using Chatter classes. Symfony provides integration with these chat services:

Service	Package	DSN
AmazonSns	`symfony/amazon-sns-notifier`	`sns://ACCESS_KEY:SECRET_KEY@default?region=REGION`
Chatwork	`symfony/chatwork-notifier`	`chatwork://API_TOKEN@default?room_id=ID`
Discord	`symfony/discord-notifier`	`discord://TOKEN@default?webhook_id=ID`
FakeChat	`symfony/fake-chat-notifier`	`fakechat+email://default?to=TO&from=FROM` or `fakechat+logger://default`
Firebase	`symfony/firebase-notifier`	`firebase://USERNAME:PASSWORD@default`
Gitter	`symfony/gitter-notifier`	`gitter://TOKEN@default?room_id=ROOM_ID`
GoogleChat	`symfony/google-chat-notifier`	`googlechat://ACCESS_KEY:ACCESS_TOKEN@default/SPACE?thread_key=THREAD_KEY`
LINE Notify	`symfony/line-notify-notifier`	`linenotify://TOKEN@default`
LinkedIn	`symfony/linked-in-notifier`	`linkedin://TOKEN:USER_ID@default`
Mastodon	`symfony/mastodon-notifier`	`mastodon://ACCESS_TOKEN@HOST`
Mattermost	`symfony/mattermost-notifier`	`mattermost://ACCESS_TOKEN@HOST/PATH?channel=CHANNEL`
Mercure	`symfony/mercure-notifier`	`mercure://HUB_ID?topic=TOPIC`
MicrosoftTeams	`symfony/microsoft-teams-notifier`	`microsoftteams://default/PATH`
RocketChat	`symfony/rocket-chat-notifier`	`rocketchat://TOKEN@ENDPOINT?channel=CHANNEL`
Slack	`symfony/slack-notifier`	`slack://TOKEN@default?channel=CHANNEL`
Telegram	`symfony/telegram-notifier`	`telegram://TOKEN@default?channel=CHAT_ID`
Twitter	`symfony/twitter-notifier`	`twitter://API_KEY:API_SECRET:ACCESS_TOKEN:ACCESS_SECRET@default`
Zendesk	`symfony/zendesk-notifier`	`zendesk://EMAIL:TOKEN@SUBDOMAIN`
Zulip	`symfony/zulip-notifier`	`zulip://EMAIL:TOKEN@HOST?channel=CHANNEL`

Caution

By default, if you have the Messenger component installed, the notifications will be sent through the MessageBus. If you don't have a message consumer running, messages will never be sent.

To change this behavior, add the following configuration to send messages directly via the transport:

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        # config/packages/notifier.yaml
framework:
    notifier:
        message_bus: false
    

Chatters are configured using the chatter_transports setting:

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        # .env
SLACK_DSN=slack://TOKEN@default?channel=CHANNEL
    

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        # config/packages/notifier.yaml
framework:
    notifier:
        chatter_transports:
            slack: '%env(SLACK_DSN)%'
    

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        <!-- config/packages/notifier.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:framework="http://symfony.com/schema/dic/symfony"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/symfony
        https://symfony.com/schema/dic/symfony/symfony-1.0.xsd">

    <framework:config>
        <framework:notifier>
            <framework:chatter-transport name="slack">
                %env(SLACK_DSN)%
            </framework:chatter-transport>
        </framework:notifier>
    </framework:config>
</container>
    

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        // config/packages/notifier.php
use Symfony\Config\FrameworkConfig;

return static function (FrameworkConfig $framework): void {
    $framework->notifier()
        ->chatterTransport('slack', env('SLACK_DSN'))
    ;
};
    

The ChatterInterface class allows you to send messages to chat services:

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        // src/Controller/CheckoutController.php
namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Notifier\ChatterInterface;
use Symfony\Component\Notifier\Message\ChatMessage;
use Symfony\Component\Routing\Attribute\Route;

class CheckoutController extends AbstractController
{
    #[Route('/checkout/thankyou')]
    public function thankyou(ChatterInterface $chatter): Response
    {
        $message = (new ChatMessage('You got a new invoice for 15 EUR.'))
            // if not set explicitly, the message is sent to the
            // default transport (the first one configured)
            ->transport('slack');

        $sentMessage = $chatter->send($message);

        // ...
    }
}
    

The send() method returns a variable of type SentMessage which provides information such as the message ID and the original message contents.

Email Channel

The email channel uses the Symfony Mailer to send notifications using the special NotificationEmail. It is required to install the Twig bridge along with the Inky and CSS Inliner Twig extensions:

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        $ composer require symfony/twig-pack twig/cssinliner-extra twig/inky-extra
    

After this, configure the mailer. You can also set the default "from" email address that should be used to send the notification emails:

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        # config/packages/mailer.yaml
framework:
    mailer:
        dsn: '%env(MAILER_DSN)%'
        envelope:
            sender: 'notifications@example.com'
    

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        <!-- config/packages/mailer.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:framework="http://symfony.com/schema/dic/symfony"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/symfony
        https://symfony.com/schema/dic/symfony/symfony-1.0.xsd">

    <framework:config>
        <framework:mailer
            dsn="%env(MAILER_DSN)%"
        >
            <framework:envelope
                sender="notifications@example.com"
            />
        </framework:mailer>
    </framework:config>
</container>
    

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        // config/packages/mailer.php
use Symfony\Config\FrameworkConfig;

return static function (FrameworkConfig $framework): void {
    $framework->mailer()
        ->dsn(env('MAILER_DSN'))
        ->envelope()
            ->sender('notifications@example.com')
    ;
};
    

Push Channel

Caution

The push channel is used to send notifications to users by using Texter classes. Symfony provides integration with these push services:

Service	Package	DSN
Engagespot	`symfony/engagespot-notifier`	`engagespot://API_KEY@default?campaign_name=CAMPAIGN_NAME`
Expo	`symfony/expo-notifier`	`expo://Token@default`
Novu	`symfony/novu-notifier`	`novu://API_KEY@default`
Ntfy	`symfony/ntfy-notifier`	`ntfy://default/TOPIC`
OneSignal	`symfony/one-signal-notifier`	`onesignal://APP_ID:API_KEY@default?defaultRecipientId=DEFAULT_RECIPIENT_ID`
PagerDuty	`symfony/pager-duty-notifier`	`pagerduty://TOKEN@SUBDOMAIN`
Pushover	`symfony/pushover-notifier`	`pushover://USER_KEY:APP_TOKEN@default`

To enable a texter, add the correct DSN in your .env file and configure the texter_transports:

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        # .env
EXPO_DSN=expo://TOKEN@default
    

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        # config/packages/notifier.yaml
framework:
    notifier:
        texter_transports:
            expo: '%env(EXPO_DSN)%'
    

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        <!-- config/packages/notifier.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:framework="http://symfony.com/schema/dic/symfony"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/symfony
        https://symfony.com/schema/dic/symfony/symfony-1.0.xsd">

    <framework:config>
        <framework:notifier>
            <framework:texter-transport name="expo">
                %env(EXPO_DSN)%
            </framework:texter-transport>
        </framework:notifier>
    </framework:config>
</container>
    

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        // config/packages/notifier.php
use Symfony\Config\FrameworkConfig;

return static function (FrameworkConfig $framework): void {
    $framework->notifier()
        ->texterTransport('expo', env('EXPO_DSN'))
    ;
};
    

Configure to use Failover or Round-Robin Transports

Besides configuring one or more separate transports, you can also use the special || and && characters to implement a failover or round-robin transport:

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        # config/packages/notifier.yaml
framework:
    notifier:
        chatter_transports:
            # Send notifications to Slack and use Telegram if
            # Slack errored
            main: '%env(SLACK_DSN)% || %env(TELEGRAM_DSN)%'

            # Send notifications to the next scheduled transport calculated by round robin
            roundrobin: '%env(SLACK_DSN)% && %env(TELEGRAM_DSN)%'
    

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        <!-- config/packages/notifier.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:framework="http://symfony.com/schema/dic/symfony"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/symfony
        https://symfony.com/schema/dic/symfony/symfony-1.0.xsd">

    <framework:config>
        <framework:notifier>
            <!-- Send notifications to Slack and use Telegram if
                 Slack errored -->
            <framework:chatter-transport name="slack">
                %env(SLACK_DSN)% || %env(TELEGRAM_DSN)%
            </framework:chatter-transport>

            <!-- Send notifications to the next scheduled transport
                 calculated by round robin -->
            <framework:chatter-transport name="slack"><![CDATA[
                %env(SLACK_DSN)% && %env(TELEGRAM_DSN)%
            ]]></framework:chatter-transport>
        </framework:notifier>
    </framework:config>
</container>
    

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        // config/packages/notifier.php
use Symfony\Config\FrameworkConfig;

return static function (FrameworkConfig $framework): void {
    $framework->notifier()
        // Send notifications to Slack and use Telegram if
        // Slack errored
        ->chatterTransport('main', env('SLACK_DSN').' || '.env('TELEGRAM_DSN'))

        // Send notifications to the next scheduled transport calculated by round robin
        ->chatterTransport('roundrobin', env('SLACK_DSN').' && '.env('TELEGRAM_DSN'))
    ;
};
    

Creating & Sending Notifications

To send a notification, autowire the NotifierInterface (service ID notifier). This class has a send() method that allows you to send a Notification to a Recipient:

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        // src/Controller/InvoiceController.php
namespace App\Controller;

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Notifier\Notification\Notification;
use Symfony\Component\Notifier\NotifierInterface;
use Symfony\Component\Notifier\Recipient\Recipient;

class InvoiceController extends AbstractController
{
    #[Route('/invoice/create')]
    public function create(NotifierInterface $notifier): Response
    {
        // ...

        // Create a Notification that has to be sent
        // using the "email" channel
        $notification = (new Notification('New Invoice', ['email']))
            ->content('You got a new invoice for 15 EUR.');

        // The receiver of the Notification
        $recipient = new Recipient(
            $user->getEmail(),
            $user->getPhonenumber()
        );

        // Send the notification to the recipient
        $notifier->send($notification, $recipient);

        // ...
    }
}
    

The Notification is created by using two arguments: the subject and channels. The channels specify which channel (or transport) should be used to send the notification. For instance, ['email', 'sms'] will send both an email and sms notification to the user.

The default notification also has a content() and emoji() method to set the notification content and icon.

Symfony provides the following recipients:

NoRecipient: This is the default and is useful when there is no need to have information about the receiver. For example, the browser channel uses the current requests' session flashbag;
Recipient: This can contain both the email address and the phone number of the user. This recipient can be used for all channels (depending on whether they are actually set).

Configuring Channel Policies

Instead of specifying the target channels on creation, Symfony also allows you to use notification importance levels. Update the configuration to specify what channels should be used for specific levels (using channel_policy):

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        # config/packages/notifier.yaml
framework:
    notifier:
        # ...
        channel_policy:
            # Use SMS, Slack and email for urgent notifications
            urgent: ['sms', 'chat/slack', 'email']

            # Use Slack for highly important notifications
            high: ['chat/slack']

            # Use browser for medium and low notifications
            medium: ['browser']
            low: ['browser']
    

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        <!-- config/packages/notifier.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:framework="http://symfony.com/schema/dic/symfony"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/symfony
        https://symfony.com/schema/dic/symfony/symfony-1.0.xsd">

    <framework:config>
        <framework:notifier>
            <!-- ... -->

            <framework:channel-policy>
                <!-- Use SMS, Slack and Email for urgent notifications -->
                <framework:urgent>sms</framework:urgent>
                <framework:urgent>chat/slack</framework:urgent>
                <framework:urgent>email</framework:urgent>

                <!-- Use Slack for highly important notifications -->
                <framework:high>chat/slack</framework:high>

                <!-- Use browser for medium and low notifications -->
                <framework:medium>browser</framework:medium>
                <framework:low>browser</framework:low>
            </framework:channel-policy>
        </framework:notifier>
    </framework:config>
</container>
    

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        // config/packages/notifier.php
use Symfony\Config\FrameworkConfig;

return static function (FrameworkConfig $framework): void {
    // ...
    $framework->notifier()
        // Use SMS, Slack and email for urgent notifications
        ->channelPolicy('urgent', ['sms', 'chat/slack', 'email'])
        // Use Slack for highly important notifications
        ->channelPolicy('high', ['chat/slack'])
        // Use browser for medium and low notifications
        ->channelPolicy('medium', ['browser'])
        ->channelPolicy('low', ['browser'])
    ;
};
    

Now, whenever the notification's importance is set to "high", it will be sent using the Slack transport:

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        // ...
class InvoiceController extends AbstractController
{
    #[Route('/invoice/create')]
    public function invoice(NotifierInterface $notifier): Response
    {
        // ...

        $notification = (new Notification('New Invoice'))
            ->content('You got a new invoice for 15 EUR.')
            ->importance(Notification::IMPORTANCE_HIGH);

        $notifier->send($notification, new Recipient('wouter@example.com'));

        // ...
    }
}
    

Customize Notifications

You can extend the Notification or Recipient base classes to customize their behavior. For instance, you can overwrite the getChannels() method to only return sms if the invoice price is very high and the recipient has a phone number:

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        namespace App\Notifier;

use Symfony\Component\Notifier\Notification\Notification;
use Symfony\Component\Notifier\Recipient\RecipientInterface;
use Symfony\Component\Notifier\Recipient\SmsRecipientInterface;

class InvoiceNotification extends Notification
{
    public function __construct(
        private int $price,
    ) {
    }

    public function getChannels(RecipientInterface $recipient): array
    {
        if (
            $this->price > 10000
            && $recipient instanceof SmsRecipientInterface
        ) {
            return ['sms'];
        }

        return ['email'];
    }
}
    

Customize Notification Messages

Each channel has its own notification interface that you can implement to customize the notification message. For instance, if you want to modify the message based on the chat service, implement ChatNotificationInterface and its asChatMessage() method:

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        // src/Notifier/InvoiceNotification.php
namespace App\Notifier;

use Symfony\Component\Notifier\Message\ChatMessage;
use Symfony\Component\Notifier\Notification\ChatNotificationInterface;
use Symfony\Component\Notifier\Notification\Notification;
use Symfony\Component\Notifier\Recipient\RecipientInterface;

class InvoiceNotification extends Notification implements ChatNotificationInterface
{
    public function __construct(
        private int $price,
    ) {
    }

    public function asChatMessage(RecipientInterface $recipient, ?string $transport = null): ?ChatMessage
    {
        // Add a custom subject and emoji if the message is sent to Slack
        if ('slack' === $transport) {
            $this->subject('You\'re invoiced '.strval($this->price).' EUR.');
            $this->emoji("money");
            return ChatMessage::fromNotification($this);
        }

        // If you return null, the Notifier will create the ChatMessage
        // based on this notification as it would without this method.
        return null;
    }
}
    

The SmsNotificationInterface, EmailNotificationInterface and PushNotificationInterface also exists to modify messages sent to those channels.

Customize Browser Notifications (Flash Messages)

The default behavior for browser channel notifications is to add a flash message with notification as its key.

However, you might prefer to map the importance level of the notification to the type of flash message, so you can tweak their style.

You can do that by overriding the default notifier.flash_message_importance_mapper service with your own implementation of FlashMessageImportanceMapperInterface where you can provide your own "importance" to "alert level" mapping.

Symfony currently provides an implementation for the Bootstrap CSS framework's typical alert levels, which you can implement immediately using:

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        # config/services.yaml
services:
    notifier.flash_message_importance_mapper:
        class: Symfony\Component\Notifier\FlashMessage\BootstrapFlashMessageImportanceMapper
    

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

    <services>
        <service id="notifier.flash_message_importance_mapper" class="Symfony\Component\Notifier\FlashMessage\BootstrapFlashMessageImportanceMapper"/>
    </services>
</container>
    

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        // config/services.php
namespace Symfony\Component\DependencyInjection\Loader\Configurator;

use Symfony\Component\Notifier\FlashMessage\BootstrapFlashMessageImportanceMapper;

return function(ContainerConfigurator $containerConfigurator) {
    $containerConfigurator->services()
        ->set('notifier.flash_message_importance_mapper', BootstrapFlashMessageImportanceMapper::class)
    ;
};
    

Testing Notifier

Symfony provides a NotificationAssertionsTrait which provide useful methods for testing your Notifier implementation. You can benefit from this class by using it directly or extending the KernelTestCase.

See testing documentation for the list of available assertions.

Disabling Delivery

While developing (or testing), you may want to disable delivery of notifications entirely. You can do this by forcing Notifier to use the NullTransport for all configured texter and chatter transports only in the dev (and/or test) environment:

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        # config/packages/dev/notifier.yaml
framework:
    notifier:
        texter_transports:
            twilio: 'null://null'
        chatter_transports:
            slack: 'null://null'
    

Using Events

The Transport class of the Notifier component allows you to optionally hook into the lifecycle via events.

The `MessageEvent` Event

Typical Purposes: Doing something before the message is sent (like logging which message is going to be sent, or displaying something about the event to be executed.

Just before sending the message, the event class MessageEvent is dispatched. Listeners receive a MessageEvent event:

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        use Symfony\Component\Notifier\Event\MessageEvent;

$dispatcher->addListener(MessageEvent::class, function (MessageEvent $event): void {
    // gets the message instance
    $message = $event->getMessage();

    // log something
    $this->logger(sprintf('Message with subject: %s will be send to %s', $message->getSubject(), $message->getRecipientId()));
});
    

The `FailedMessageEvent` Event

Typical Purposes: Doing something before the exception is thrown (Retry to send the message or log additional information).

Whenever an exception is thrown while sending the message, the event class FailedMessageEvent is dispatched. A listener can do anything useful before the exception is thrown.

Listeners receive a FailedMessageEvent event:

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        use Symfony\Component\Notifier\Event\FailedMessageEvent;

$dispatcher->addListener(FailedMessageEvent::class, function (FailedMessageEvent $event): void {
    // gets the message instance
    $message = $event->getMessage();

    // gets the error instance
    $error = $event->getError();

    // log something
    $this->logger(sprintf('The message with subject: %s has not been sent successfully. The error is: %s', $message->getSubject(), $error->getMessage()));
});
    

The `SentMessageEvent` Event

Typical Purposes: To perform some action when the message is successfully sent (like retrieve the id returned when the message is sent).

After the message has been successfully sent, the event class SentMessageEvent is dispatched. Listeners receive a SentMessageEvent event:

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        use Symfony\Component\Notifier\Event\SentMessageEvent;

$dispatcher->addListener(SentMessageEvent::class, function (SentMessageEvent $event): void {
    // gets the message instance
    $message = $event->getMessage();

    // log something
    $this->logger(sprintf('The message has been successfully sent and has id: %s', $message->getMessageId()));
});
    

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.

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