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b5cc4dc44a
When SimplePie parses HTTP headers, it combines multiple values for the same header into a comma-separated string. `WP_SimplePie_File` overrides the parsing, but was leaving them as an array instead. That lead to a fatal error in PHP 8, because other parts of the codebase ended up passing an array to a function that expected a string. Props david.binda, litemotiv, inc2734, NicolasKulka, hellofromTonya, mbabker, skithund, SergeyBiryukov, desrosj, timothyblynjacobs. Reviewed by SergeyBiryukov, iandunn. Merges [49803] and [49805] to the 5.6 branch. Fixes #51056. See #51956. git-svn-id: https://develop.svn.wordpress.org/branches/5.6@49806 602fd350-edb4-49c9-b593-d223f7449a82