What is Registry in Magento2 and Why use? [duplicate]

Please read this question's answer as your question is already asked here

what is the use of core registry in magento 2?

Alan Storm has written a great article on registry object see below link

https://alanstorm.com/magento-2-registry-object/

Basically registry is used to store global variable You can store global variables via register() method and fetch value of variables via registry() method.

How to create a registry in magento 2

Here is the quick code snippet to help you work with Magento 2 registry objects

/** * @var \Magento\Framework\Registry */ protected $_registry; /** * ... * ... * @param \Magento\Framework\Registry $registry, */ public function __construct( ..., ..., \Magento\Framework\Registry $registry, ... ) { $this->_registry = $registry; ... ... } /** * Setting custom variable in registry to be used * */ public function setCustomVariable() { $this->registry->register('custom_var', 'Added Value'); } /** * Retrieving custom variable from registry * @return string */ public function getCustomVariable() { return $this->registry->registry('custom_var'); } /** * Return catalog product object * * @return \Magento\Catalog\Model\Product */ public function getProduct() { return $this->_registry->registry('product'); } /** * Return catalog current category object * * @return \Magento\Catalog\Model\Category */ public function getCurrentCategory() { return $this->_registry->registry('current_category'); } 

I hope it helps!