Function mcrypt_module_close() is deprecated in magento 2.3.1

Array
(
    [type] => 8192
    [message] => Function mcrypt_module_close() is deprecated
    [file] => /vendor/magento/framework/Encryption/Adapter/Mcrypt.php
    [line] => 94
)

PHP Version 7.1.27
This Issue facing after upgrade Magento 2.1 to Magento2.3.1 with Porto theme version 3.7.1

Anysolution for that?