If it is single PHP file containing different functions then you can create a Model class in your Model folder. But this Class will not extend Eloquent. It is a simple class. For example I have a class as General.php
containing static methods of general functionality. As Model is autoloaded so I don't need to worry about including file. It is automatically included.
But if it is a directory containing different PHP files or PHP classes then you can create a directory in your app
directory and add the path of that directory in providers
array in app.php
in config
directory. You can also create an aliases
of your library by putting entry in aliases
under providers
in app.php
.