Jeremy Felt 15a12ce4f0 Multisite: Introduce get_current_network_id()
Similar to `get_current_blog_id`, this can be used to get the ID of the `$current_site` global. If not available, it will fallback to the main network ID. In single site, this will return 1.

Props spacedmonkey, flixos90.
Fixes #33900.


git-svn-id: https://develop.svn.wordpress.org/trunk@37670 602fd350-edb4-49c9-b593-d223f7449a82
2016-06-09 20:33:35 +00:00
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