how can I include some custom variable from functions.php?

WordPress theme files are called thru functions/classes, so variables declared in functions.php are not recognized by other theme files, until you specify you want to use the global value of the variable. Do so like this in your theme template files:

global $mysite_address_url;

you can then use $mysite_address_url as you’d like.

To read more about PHP’s variable scope, see this

Also, if you want to use your website’s URL, it’d be better to use the home_url() function

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