wp-includes/atomlib.php:342$parser$data function cdata($parser, $data) { $this->_p("data: #" . str_replace(array("\n"), array("\\n"), trim($data)) . "#"); if(!empty($this->in_content)) { array_push($this->in_content, $data); } }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/atomlib.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.