wp-includes/SimplePie/src/Parse/Date.php:629Add a callback method to parse a date
$callbackcallablevoid public function add_callback(callable $callback) { $this->user[] = $callback; }One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
none to void.verified against sourcesrc/wp-includes/SimplePie/src/Parse/Date.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.