How to use an external PHP class without a namespace in a custom module?

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1

Hello,

Im using mandrill lib files into my custom module. So i successfully import the mandrill file using composer.

In the mandrill lib files not used namespace method, So how can i use the lib files into custom model and helper classes.

2

How do I use a global classes in a namespace: http://php.net/manual/en/language.namespaces.faq.php#language.namespaces.faq.globalclass