wp-includes/ID3/module.audio-video.quicktime.php:3124Helper functions for m4b audiobook chapters code by Steffen Hartmann 2015-Nov-08.
$infoarray$tagstring$historystring$resultarray public function search_tag_by_key($info, $tag, $history, &$result) { foreach ($info as $key => $value) { $key_history = $history.'/'.$key; if ($key === $tag) { $result[] = array($key_history, $info); } else { if (is_array($value)) { $this->search_tag_by_key($value, $tag, $key_history, $result); } } } }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ID3/module.audio-video.quicktime.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.