How to prevent the use of global variable $_FILES in code?
Magento application does not directly use any PHP superglobals variable like $GLOBALS, $_SERVER, $_GET, $_POST, $_FILES, $_COOKIE, $_SESSION, $_REQUEST.
You don’t need to directly use $_FILES in your code for file/images save. This may be lead to security vulnerabilities. Continue reading “How to prevent error: Use of $_FILES is discouraged in Magento 2?”