Fix various compatibility issues with PHP 8

libs/swiftmailer/classes/Swift/Plugins/Reporter.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2004-2009 Chris Corbyn
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * The Reporter plugin sends pass/fail notification to a Reporter.
+ *
+ * @author Chris Corbyn
+ */
+interface Swift_Plugins_Reporter
+{
+    /** The recipient was accepted for delivery */
+    const RESULT_PASS = 0x01;
+
+    /** The recipient could not be accepted */
+    const RESULT_FAIL = 0x10;
+
+    /**
+     * Notifies this ReportNotifier that $address failed or succeeded.
+     *
+     * @param Swift_Mime_Message $message
+     * @param string             $address
+     * @param int                $result  from {@link RESULT_PASS, RESULT_FAIL}
+     */
+    public function notify(Swift_Mime_Message $message, $address, $result);
+}