RSSCache::set( $url, $rss )

Source

File: wp-includes/rss.php

function set ($url, $rss) {
		$cache_option = 'rss_' . $this->file_name( $url );

		set_transient($cache_option, $rss, $this->MAX_AGE);

		return $cache_option;
	}

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/rsscache/set