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b96a51c529
Validate the requested sitemap is a string before attempting to use it in a provider. This prevents `WP_Sitemaps_Registry::get_provider()` from triggering a fatal error in more recent versions of PHP. The errors can be triggered by items outside the site owner or developers control (such as a user visiting `?sitemap[foo]=bar`) so the code fails silently to avoid filling error logs with unfixable errors. Props costdev, dd32. Fixes #56336. git-svn-id: https://develop.svn.wordpress.org/trunk@53838 602fd350-edb4-49c9-b593-d223f7449a82