Getting all request parameters in Symfony 2

In Symfony 2, you can use the $request->request object to get all request parameters. For example, if you have a form submission with multiple input fields, you can use the following code to retrieve all the parameters:

<?php

$request = $this->get('request');
$parameters = $request->request->all();

The $parameters variable will now contain an array of all request parameters and their values.

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Alternatively, you can use the get method of the $request->request object to get a specific request parameter by name:

<?php

$parameterValue = $request->request->get('parameterName');

It's also possible to use $request->query->all() to get the query parameters and $request->attributes->all() to get the attributes.