Fix various compatibility issues with PHP 8

libs/swiftmailer/classes/Swift/Transport/SimpleMailInvoker.php

@@ -0,0 +1,39 @@
+<?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.
+ */
+
+/**
+ * This is the implementation class for {@link Swift_Transport_MailInvoker}.
+ *
+ * @author     Chris Corbyn
+ */
+class Swift_Transport_SimpleMailInvoker implements Swift_Transport_MailInvoker
+{
+    /**
+     * Send mail via the mail() function.
+     *
+     * This method takes the same arguments as PHP mail().
+     *
+     * @param string $to
+     * @param string $subject
+     * @param string $body
+     * @param string $headers
+     * @param string $extraParams
+     *
+     * @return bool
+     */
+    public function mail($to, $subject, $body, $headers = null, $extraParams = null)
+    {
+        if (!ini_get('safe_mode')) {
+            return @mail($to, $subject, $body, $headers, $extraParams);
+        }
+
+        return @mail($to, $subject, $body, $headers);
+    }
+}