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Tested with 3 multisite installations, all of them WordPress 4.9.4 Also tested up to 5.1, still amazing. Works just as intended. Now I don't have to manually trudge among tables just to find the site ID. Code is compact, secure & slim. Huge help, thanks!
With the current blog’s / site’s ID WP Show Site ID adds a tiny bit of very useful information to the Admin Bar. What’s more, it gives you a readily accessible link to the Site Info screen! Thanks!