Fix various compatibility issues with PHP 8

libs/swiftmailer/classes/Swift/Mime/HeaderFactory.php

@@ -0,0 +1,78 @@
+<?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.
+ */
+
+/**
+ * Creates MIME headers.
+ *
+ * @author Chris Corbyn
+ */
+interface Swift_Mime_HeaderFactory extends Swift_Mime_CharsetObserver
+{
+    /**
+     * Create a new Mailbox Header with a list of $addresses.
+     *
+     * @param string       $name
+     * @param array|string $addresses
+     *
+     * @return Swift_Mime_Header
+     */
+    public function createMailboxHeader($name, $addresses = null);
+
+    /**
+     * Create a new Date header using $timestamp (UNIX time).
+     *
+     * @param string $name
+     * @param int    $timestamp
+     *
+     * @return Swift_Mime_Header
+     */
+    public function createDateHeader($name, $timestamp = null);
+
+    /**
+     * Create a new basic text header with $name and $value.
+     *
+     * @param string $name
+     * @param string $value
+     *
+     * @return Swift_Mime_Header
+     */
+    public function createTextHeader($name, $value = null);
+
+    /**
+     * Create a new ParameterizedHeader with $name, $value and $params.
+     *
+     * @param string $name
+     * @param string $value
+     * @param array  $params
+     *
+     * @return Swift_Mime_ParameterizedHeader
+     */
+    public function createParameterizedHeader($name, $value = null, $params = array());
+
+    /**
+     * Create a new ID header for Message-ID or Content-ID.
+     *
+     * @param string       $name
+     * @param string|array $ids
+     *
+     * @return Swift_Mime_Header
+     */
+    public function createIdHeader($name, $ids = null);
+
+    /**
+     * Create a new Path header with an address (path) in it.
+     *
+     * @param string $name
+     * @param string $path
+     *
+     * @return Swift_Mime_Header
+     */
+    public function createPathHeader($name, $path = null);
+}