wp-includes/Requests/src/Response/Headers.php:77Get all values for a given header
$offsetstringarray|null public function getValues($offset) { if (!is_string($offset) && !is_int($offset)) { throw InvalidArgument::create(1, '$offset', 'string|int', gettype($offset)); } if (is_string($offset)) { $offset = strtolower($offset); } if (!isset($this->data[$offset])) { return null; } return $this->data[$offset]; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/Requests/src/Response/Headers.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.