Craft\Workflow_SubmissionsService::approveSubmission PHP Method

    public function approveSubmission(Workflow_SubmissionModel $model, $draft)
    {
        $settings = craft()->workflow->getSettings();
        // Fire an 'onBeforeApproveSubmission' event
        $event = new Event($this, array('submission' => $model));
        $this->onBeforeApproveSubmission($event);
        // Allow event to cancel submission saving
        if (!$event->performAction) {
            return false;
        }
        // Check for approving a Draft - need to publish not just save
        if ($draft) {
            $draft->enabled = true;
            craft()->entryRevisions->publishDraft($draft);
            // The Draft entry has now been deleted, so we don't need to update the submission record
            // because it no also doesn't exist (due to cascade deleting of records)
            $result = true;
        } else {
            $entry = craft()->entries->getEntryById($model->owner->id);
            $entry->enabled = true;
            craft()->entries->saveEntry($entry);
            // Then, update our submission record with the necessary information
            $result = $this->save($model);
        }
        // Fire an 'onSaveSubmission' event
        $this->onApproveSubmission(new Event($this, array('submission' => $model)));
        // Trigger notification to editor
        if ($settings->editorNotifications) {
            $this->_sendEditorNotificationEmail($model);
        }
        return $result;
    }