Get a configuration variable at runtime

I've made a Gerrit change for a Phabricator task that uses the
$wgSiteMatrixSites variable, which is created at runtime. How can I view
its value on Meta?

The issue is that this variable seems to have a different structure on each
site, depending on the available data. I’ve written traversal code designed
to handle any possible structure, but I can’t confirm if it works correctly
for Meta.

If I could get the Meta value—or even just the first few pages—it would be
very helpful.

Thank you in advance.
Igal (User:Ikhitron)

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