## Magento 1.9.4.0 Admin does not work with PHP 7.2

I have updated my Site Form 1.9.3 to 1.9.4 and updated the PHP version from 5.6 to 7.2.
In PHP version 5.6, both the admin and the front work, but on the PHP 7.2 front, this works fine, but when I log in to admin, I get a blank screen.
No errors, warnings or hints and no logs are created.

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## Magento 1 with Php 7.2, Add a bug to cart if the product has an option

I've used Magneto 1.9.3.10 with the PHP 7.2 patch.
When I click on "Add to Cart" for a product that has options and click "Options," the following error message appears:

```

Exception: Warning: count (): The parameter must be an array or an object, the countable in /var/www/html/app/code/core/Mage/Catalog/Model/Product/Option/Type/Select.php online implements 57 in /var/www/html/app/code/core/Mage/Core/functions.php:232
Stack trace:
# 0 /var/www/html/app/code/core/Mage/Catalog/Model/Product/Option/Type/Select.php(57): mageCoreErrorHandler (2, & # 39; count (): parame ... & # 39 ;, & # 39; / var / www / html / a ... & # 39; 57, array)
# 1 /var/www/html/app/code/core/Mage/Catalog/Model/Product/Type/Abstract.php(533): Mage_Catalog_Model_Product_Option_Type_Select-> validateUserValue (NULL)
# 2 /var/www/html/app/code/core/Mage/Catalog/Model/Product/Type/Abstract.php(322): Mage_Catalog_Model_Product_Type_Abstract -> _ prepareOptions (Object (Varien_Object), Object (Mage_Catalog_Mod_).)
# 3 /var/www/html/app/code/core/Mage/Catalog/Model/Product/Type/Abstract.php(410): Mage_Catalog_Model_Product_Type_Abstract -> _ prepareProduct (Object (Varien_Object), Object (Mage_Catalog_Modach) & # 39 ;)
# 4 /var/www/html/app/code/core/Mage/Sales/Model/Quote.php(969): Mage_Catalog_Model_Product_Type_Abstract-> prepareForCartAdvanced (object (Varien_Object), object (Mage_Catalog_Model_Product) & # 39;
# 5 /var/www/html/app/code/core/Mage/Sales/Model/Quote.php(1045): Mage_Sales_Model_Quote-> addProductAdvanced (Object (Mage_Catalog_Model_Product), Object (Varien_Object), & # 39; full & # 39 ;)
# 6 /var/www/html/app/code/core/Mage/Checkout/Model/Cart.php(268): Mage_Sales_Model_Quote-> addProduct (Object (Mage_Catalog_Model_Product), Object (Varien_Object))
# 7 /var/www/html/app/code/core/Mage/Checkout/controllers/CartController.php(235): Mage_Checkout_Model_Cart-> addProduct (Object (Mage_Catalog_Model_Product), Array)
# 8 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Checkout_CartController-> addAction ()
# 9 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action-> dispatch (& # 39; add & # 39;)
# 10 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard-> Match (Object (Mage_Core_Controller_Request_Http))
# 11 /var/www/html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front-> dispatch ()
# 12 /var/www/html/app/Mage.php(686): Mage_Core_Model_App-> run (Array)
# 13 /var/www/html/index.php(85): Mage :: run (& # 39 ;, & # 39; store & # 39;)
# 14 {main}

```

## What is the coefficient in expression \$ 72 – (- 4x)? \$

What is the coefficient in the expression? $$72 – (-4x)?$$

I am confused when it is -4 or 4 and why? Could you please explain how you derive the answer?
I'm a sixth student and I'm learning about coefficients.

## 72 or 300 dpi images for the website?

As @RRWH noted, web images are displayed with standard monitor dpi, which is about 96 dpi today. Downloaded images tend to compensate for high DPI settings Pixel counts, which means you download a large picture. Which of course is useless – the pages are scaled to monitor the resolution. It makes little sense to upload 4k background photos if only a fraction of the users display them on 4k monitors. Worse still, this can dramatically affect the experience of those who want to view your website through their mobile phone.

I assume that you are referring to archive photos and other graphics that you can use for your website. In that case, it's a good idea to download large file sizes that you can downsize. Decrease the size of the images, the images still look sharp. The resizing leads to information loss. If you send source files for someone to use in Photoshop, large image files are good for the same reason. It's easier to cut and edit image areas without losing details.

Your actual web graphics should be as clear and small as possible. A couple of dozen kilobytes now do not seem to make much of a difference, especially since it's assumed that everyone is on broadband, but the more users you have, the more things are constantly being downloaded. You may not be aware of it, but what about the bandwidth of your web host?

Of course HD-Web is not just pictures. We also expect HD video. Always provides lower or better coded versions. There is always a restless balance between file size and quality. It will never disappear, no matter how fast the internet gets. That just means that there is a new basis for people's expectations.

Watch WebM and HTML5 videos to move elements on your website. They are much faster and more beautiful to look at without affecting the file size.

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