wp-includes/PHPMailer/PHPMailer.php:5501Perform a callback.
$isSentbool$toarray$ccarray$bccarray$subjectstring$bodystring$fromstring$extraarray protected function doCallback($isSent, $to, $cc, $bcc, $subject, $body, $from, $extra) { if (!empty($this->action_function) && is_callable($this->action_function)) { call_user_func($this->action_function, $isSent, $to, $cc, $bcc, $subject, $body, $from, $extra); } }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/PHPMailer/PHPMailer.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.