You can use to set and get custom session value like below
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$catalogSession = $objectManager->get('\Magento\Catalog\Model\Session');
//customerSession \Magento\Customer\Model\Session;
//checkoutSession = \Magento\Checkout\Model\Session;
// set session variables and their value
$catalogSession->setMyName('Test');
// print session variables value
echo $catalogSession->getMyName(); // Test
// Unset session
$catalogSession->unsMyName();
You can use dependency injection also like below
<?php
namespace Vendor\Module\Block;
class Session extends \Magento\Framework\View\Element\Template
{
protected $_catalogSession;
public function __construct(
\Magento\Backend\Block\Template\Context $context,
\Magento\Catalog\Model\Session $catalogSession,
array $data = []
)
{
$this->_catalogSession = $catalogSession;
parent::__construct($context, $data);
}
public function _prepareLayout()
{
return parent::_prepareLayout();
}
public function getCatalogSession()
{
return $this->_catalogSession;
}
}
?>
Use below code in phtml file
$block->getCatalogSession()->setMyName('Test');
echo $block->getCatalogSession()->getMyName(); // Test