Fix various compatibility issues with PHP 8

libs/swiftmailer/classes/Swift/Plugins/Loggers/EchoLogger.php

@@ -0,0 +1,58 @@
+<?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.
+ */
+
+/**
+ * Prints all log messages in real time.
+ *
+ * @author Chris Corbyn
+ */
+class Swift_Plugins_Loggers_EchoLogger implements Swift_Plugins_Logger
+{
+    /** Whether or not HTML should be output */
+    private $_isHtml;
+
+    /**
+     * Create a new EchoLogger.
+     *
+     * @param bool $isHtml
+     */
+    public function __construct($isHtml = true)
+    {
+        $this->_isHtml = $isHtml;
+    }
+
+    /**
+     * Add a log entry.
+     *
+     * @param string $entry
+     */
+    public function add($entry)
+    {
+        if ($this->_isHtml) {
+            printf('%s%s%s', htmlspecialchars($entry, ENT_QUOTES), '<br />', PHP_EOL);
+        } else {
+            printf('%s%s', $entry, PHP_EOL);
+        }
+    }
+
+    /**
+     * Not implemented.
+     */
+    public function clear()
+    {
+    }
+
+    /**
+     * Not implemented.
+     */
+    public function dump()
+    {
+    }
+}