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apply_filters( 'feed_content_type', string $content_type, string $type )

Filters the content type for a specific feed type.

$content_type: (string) Content type indicating the type of data that a feed contains.
$type: (string) Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'.

Used By	Description
wp-includes/feed.php: feed_content_type()	Return the content type for specified feed type.

Version	Description
2.8.0	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/feed_content_type