wp-includes/PHPMailer/SMTP.php:1021Send an SMTP QUIT command.
$close_on_errorbooloptionaltruebool public function quit($close_on_error = true) { $noerror = $this->sendCommand('QUIT', 'QUIT', 221); $err = $this->error; //Save any error if ($noerror || $close_on_error) { $this->close(); $this->error = $err; //Restore any error from the quit command } return $noerror; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/PHPMailer/SMTP.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.