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I want to add a COOKIE with value and some duration, how to do it in magento 2.

Thanks

IMO the best approach would be to create a class to wrap the cookie creation and then just use it where you want.

The Cookie Class

{Vendor}/{Module}/Cookie/Example.php

<?php 



namespace VendorModuleCookie;



use MagentoFrameworkStdlibCookieManagerInterface;

use MagentoFrameworkStdlibCookieCookieMetadataFactory;

use MagentoFrameworkSessionSessionManagerInterface;



class Example

{

    /**

     * Name of cookie that holds private content version

     */

    const COOKIE_NAME = 'example';



    /**

     * CookieManager

     *

     * @var CookieManagerInterface

     */

    private $cookieManager;



    /**

     * @var CookieMetadataFactory

     */

    private $cookieMetadataFactory;



    /**

     * @var SessionManagerInterface

     */

    private $sessionManager;



    /**

     * @param CookieManagerInterface $cookieManager

     * @param CookieMetadataFactory $cookieMetadataFactory

     * @param SessionManagerInterface $sessionManager

     */

    public function __construct(

        CookieManagerInterface $cookieManager,

        CookieMetadataFactory $cookieMetadataFactory,

        SessionManagerInterface $sessionManager

    ) {

        $this->cookieManager = $cookieManager;

        $this->cookieMetadataFactory = $cookieMetadataFactory;

        $this->sessionManager = $sessionManager;

    }



    /**

     * Get form key cookie

     *

     * @return string

     */

    public function get()

    {

        return $this->cookieManager->getCookie(self::COOKIE_NAME);

    }



    /**

     * @param string $value

     * @param int $duration

     * @return void

     */

    public function set($value, $duration = 86400)

    {

        $metadata = $this->cookieMetadataFactory

            ->createPublicCookieMetadata()

            ->setDuration($duration)

            ->setPath($this->sessionManager->getCookiePath())

            ->setDomain($this->sessionManager->getCookieDomain());



        $this->cookieManager->setPublicCookie(

            self::COOKIE_NAME,

            $value,

            $metadata

        );

    }



    /**

     * @return void

     */

    public function delete()

    {

        $metadata = $this->cookieMetadataFactory

            ->createPublicCookieMetadata()

            ->setDuration($duration)

            ->setPath($this->sessionManager->getCookiePath())

            ->setDomain($this->sessionManager->getCookieDomain());



        $this->cookieManager->deleteCookie(

            self::COOKIE_NAME,

            $metadata

        );

    }

}

This example was based on MagentoFrameworkAppPageCacheFormKey
and represent a single cookie with name "example"

If you want to add some custom properties to the $metadata (PublicCookieMetadata) as change the path,http_only, etc you should refactor the set() and/or delete() method(s).

How to use it

You can access that class simply using the Object Manager in almost anywhere (Ugly Approach):

$objectManager = MagentoFrameworkAppObjectManager::getInstance();

$objectManager->get('VendorModuleCookieExample')

    ->set('value', 3600);

Depending "where" you need to create the cookie you can take a look at the constructor of your class maybe you already have an Object manager there, if not you can also inject it in the constructor.

You can set & get cookie using php basic function like this:

//set cookie

$cookie_name = "magento";

$cookie_value = "How to Cookie";

setcookie($cookie_name, $cookie_value, time()+3600); /* expire in 1 hour */



//get cookie

if(!isset($_COOKIE[$cookie_name])) {

    echo "Cookie named '" . $cookie_name . "' is not set!";

} else {

    echo "Cookie '" . $cookie_name . "' is set!<br>";

    echo "Value is: " . $_COOKIE[$cookie_name];

}