BLOG_ID_CURRENT_SITE vs. SITE_ID_CURRENT_SITE in WordPress Multisite?

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I’ve been trying to figure out why we have the constants BLOG_ID_CURRENT_SITE and SITE_ID_CURRENT_SITE (vs. hardcoding them to be equal to 1), what exactly the differences are, and when either of them will not equal 1?

Any insight will be appreciated. Thanks in advance.

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I addressed a similar question on StackOverflow last month.

In MultiSite, “blog” is a reference to an individual website. “Site” is a reference to a network of “blogs.” In the future, there’s the likelihood that WordPress will be able to power multiple networks (“site”s) in addition to its current state of multiple “blog”s.

Update

I’ve done some more digging, and discovered a plug-in that easily allows you to split your multi-site installation into a multi-network one: WP Multi Network.

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