The $current_user is still a valid global, however like all globals, you should avoid relying on them.
If you need the current user in a function, do this instead:
$current_user = wp_get_current_user();
Also be aware that this may return false if no user is logged in on the current request, while the global $current_user may simply be an invalid instance of the WP_User (with an ID of zero). This is for backwards compatibility, and a wonderful reason to not rely on the globals.
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