wp-includes/SimplePie/src/SimplePie.php:988Set the length of time (in seconds) that the contents of a feed will be cached
$secondsintoptional3600void public function set_cache_duration(int $seconds = 3600) { $this->cache_duration = $seconds; }One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
none to void.verified against sourcesrc/wp-includes/SimplePie/src/SimplePie.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.