How to get $_POST and $_GET parameters

Question

I ajaxly call a route and pass data to it, In my controller, I want to get $_POST['var'] , $_POST['var2'], it seems because of using HttpFoundation in drupal 8, $_POST and $_GET are not exists in old method, How I can access $_POST parameters in custom Controller?

Answer 1

From the change record:

$name = $_POST['name']; // form param

becomes

$name = \Drupal::request()->request->get('name'); // form param

Incidentally, for GET vars, you would use:

$query = \Drupal::request()->query->get('name');

Answer 2

In a controller get the request with a type-hinted argument Request $request:

<?php

namespace Drupal\mymodule\Controller;

use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\HttpFoundation\Request;

class ExampleController extends ControllerBase {

  /**
   * Controller to return a POST or a GET parameter.
   */
  public function action(Request $request) {

    // get your POST parameter
    $foo = $request->request->get('foo');

    // or get your GET parameter
    $foo = $request->query->get('foo');

    // POST requests are not cached, but for GET you need a cache context
    return [
      '#markup' => $foo,
      '#cache' => ['contexts' => ['url.query_args:foo']],
    ];
  }

}

More info https://www.drupal.org/docs/8/api/routing-system/using-parameters-in-routes

Answer 3

Inject the RequestStack into your controller.

The current request contains the query attribute that in turn contains the GET parameters. request contains the POST parameters.

<?php

namespace Drupal\example_module\Controller;

use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * An example controller.
 */
class ExampleController extends ControllerBase {

  /**
   * @var Symfony\Component\HttpFoundation\RequestStack
   */
  private $requestStack;

  /**
   * Constructor.
   *
   * @param Symfony\Component\HttpFoundation\RequestStack $request_stack
   */
  public function __construct(RequestStack $request_stack) {
    $this->requestStack = $request_stack;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('request_stack')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function action() {
    // Get your GET parameter here.
    $this->requestStack->getCurrentRequest()->query->get('foo');
  }

}

Answer 4

You can check the Request object like

\Drupal::request()->getMethod();

it will returns GET or POST or whatever. If you are working inside an object, remember to DI the Request service.

Answer 5

If you are using Content-Type: application/json please use :

$post_data = json_decode( $this->request->getContent(),TRUE);

Answer 6

None of the other answers worked for me but I found this that did:

$request->getContent();

Answer 7

Here's the example of accessing URL parameters and passing them to a TWIG template, I am considering you have already created your module and required files and suppose "/test?fn=admin" is your URL

1. In Your .module file implement hook_theme and define variables and template name (Make sure you replace "_" with "-" when creating the template file)

function my_module_theme () {   
     return [
      'your_template_name' => [               
         'variables' => [
             'first_name'    => NULL,
          ],   
     ]; 
   }

Now create your controller and put below code in it.

 namespace Drupal\my_module\Controller;

 use Drupal\Core\Controller\ControllerBase;
 use Symfony\Component\HttpFoundation\Request;


 class MyModule extends ControllerBase {

   public function content(Request $request) {

     return [
       '#theme' => 'my_template',
       '#first_name' => $request->query->get('fn'), //This is because the parameters are in $_GET, if you are accessing from $_POST then use "request" instead "query"
     ];
   }

 }

Now in your TWIG file which should be "my-template.html.twig" you can access this parameter as,

 <h3>First Name: {{ first_name }}</h3>

And its done. Hope this helps.