Magento 2
The `app/functions.php` file is deprecated in Magento 2.3 since 2018-09-07
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dmitry_fedyuk
(Dmitrii Fediuk)
September 12, 2018, 2:15pm
1
https://github.com/magento/magento2/blob/7d6aa400/app/functions.php#L9-L10