Symfony route optional parameter

Symfony routes can have optional parameters, so that your path works with or without a parameter. This is something that usually a good service should do so that the user won’t get lost and no error pages occur.

This feature can be achieved by setting a default value for the parameter.

Here are the examples of setting routes in Symfony with default parameter.
Annotation:

/**

* @Route("/task/{task}", defaults={"task" = 1})

public function taskAction($task)

{

}

YAML:

task:

path: /task/{task}

defaults: { _controller: AppBundle:Task:index, task: 1 }

XML:

<?xml version="1.0" encoding="UTF-8" ?>

<routes xmlns="http://symfony.com/schema/routing"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://symfony.com/schema/routing

http://symfony.com/schema/routing/routing-1.0.xsd">

<default key="_controller">AppBundle:Task:index</default>

</route>

</routes>

PHP:

use Symfony\Component\Routing\RouteCollection;

use Symfony\Component\Routing\Route;

$collection = new RouteCollection();

$collection->add('task', new Route('/task/{task}', array(

'_controller' => 'AppBundle:Task:index',

'task' => 1,

)));

return $collection;

By using this, you can access pages /task and /task/2 by using the same controller and route. Remember that trailing slash /task/ does not work by default on Symfony (you need to redirect trailing slashes).