Files
wordpress/wp-includes
iandunn d544fc7cb4 Feed: Merge multiple header values to avoid fatal error.
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.
Fixes #51056. See #51956.


Built from https://develop.svn.wordpress.org/trunk@49803


git-svn-id: http://core.svn.wordpress.org/trunk@49526 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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