wp-includes/class-wp-feed-cache-transient.php:83Saves data to the transient.
$dataarray|SimplePie\SimplePietrue public function save( $data ) { if ( $data instanceof SimplePie\SimplePie ) { $data = $data->data; } set_site_transient( $this->name, $data, $this->lifetime ); set_site_transient( $this->mod_name, time(), $this->lifetime ); return true; }Introduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-feed-cache-transient.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.