wp-includes/SimplePie/src/SimplePie.php:2289Get the URL for the feed
$permanentbooloptionalfalsestring|null public function subscribe_url(bool $permanent = false) { if ($permanent) { if ($this->permanent_url !== null) { // sanitize encodes ampersands which are required when used in a url. return str_replace( '&', '&', $this->sanitize( $this->permanent_url, self::CONSTRUCT_IRI ) ); } } else { if ($this->feed_url !== null) { return str_replace( '&', '&', $this->sanitize( $this->feed_url, self::CONSTRUCT_IRI ) ); } } return null; }Introduced in Preview Release (previously called <code>get_feed_url()</code> since SimplePie 0.8.). Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/SimplePie/src/SimplePie.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.