in order to get any value per specific scope you can use the below parameters 

First you need to initialize scopeConfig

 

 * @var \Magento\Framework\App\Config\ScopeConfigInterface
*/
protected $_scopeConfig;

 

in the constrructer of your class 

Get total weight of the cart in Magento2

in order to get the total weight of the cart you can use two main methods, we will list them here 

First Method 

$weight = {getQuote()}
              ->getShippingAddress()
              ->getWeight();

 

 

Second method 

$items = {getQuote()}->getAllItems();

$weight = 0;
foreach($items as $item) {
    $weight += ($item->getWeight() * $item->getQty()) ;
}

echo $weight;

the easy way to Inject reCaptcha in phtml file in Magento 2 to add PHP code, use this code to add reCaptcha into newsletter form

 

If you are wondering how to get the value of product custom option from cart and order in Magento 2, this is the right place for you to learn that. Published by Mageplaza, this topic will point you how to do that with two examples as the following.

Firstly, you can use ObjectManager:

Get custom options of products present in shopping cart

How to change block's template with alias in Magento2 extension

as we know that some blocks does have alias without name in the xml files, so here we will see how we can change the template for a block with alias instead of name

I will put here an example on how to do it , this was tested in Magento 2.3.4

 

in the parent module we have this XML 

 

Sometime you want to know the expected URL Key for an product to see if it will be okay not not, the best way I have seen is to see how Magento itself create it, for that the easy way is to create a new product with any name and get the product id , then load the product ... see below 

'cURL' is a command-line tool that lets you transmit HTTP requests and receive responses from the command line or a shell script. It is available for Linux distributions, Mac OS X, and Windows. To use cURL to run your REST web API call, use the cURL command syntax to construct the command. To create the endpoint in the call, append the REST URI that you constructed in Construct a request to this URL: https:////rest/ To pass the customer data object in the POST call payload, specify a JSON or XML request body on the call.

It's very recommanded to delete unused carts after you finish the upgrade using these queries all customers carts that are not converted to order will be deleted 

 

select * 
FROM `quote_address`
WHERE `customer_address_id` IS NULL AND `firstname` IS NULL AND `lastname` IS NULL and quote_id in (SELECT entity_id FROM `quote` where is_active= 1)

 

select *    from quote where entity_id not in (select quote_id from quote_address)

Error : Notice: Undefined offset: 2 in vendor\magento\framework \Encryption\Encryptor.php

Some time you will have the below error after you move Magento2 from server to another server with different PHP version or even with the same PHP version , now what is the first solution we can do 

mostly this library will be missed 

php-sodium

So we need to install it , below is some command we can do to install it on Centos

Most programmer need to change sometime the password of one customer programmatically, in this wiki I will give you a code to change the password programmatically