wp-includes/SimplePie/src/Enclosure.php:296Get a single caption
$keyintoptional0SimplePie\Caption|null public function get_caption($key = 0) { $captions = $this->get_captions(); if (isset($captions[$key])) { return $captions[$key]; } return null; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/SimplePie/src/Enclosure.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.