Fix various compatibility issues with PHP 8

libs/ical/Property/Event/Attendees.php

@@ -0,0 +1,95 @@
+<?php
+
+/*
+ * This file is part of the eluceo/iCal package.
+ *
+ * (c) Markus Poerschke <markus@eluceo.de>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace Eluceo\iCal\Property\Event;
+
+use Eluceo\iCal\Property;
+
+class Attendees extends Property
+{
+    /**
+     * @var Property[]
+     */
+    protected $attendees = [];
+
+    public function __construct()
+    {
+        $this->name = 'ATTENDEES';
+        // prevent super constructor to be called
+    }
+
+    /**
+     * @param       $value
+     * @param array $params
+     *
+     * @return $this
+     */
+    public function add($value, $params = [])
+    {
+        $this->attendees[] = new Property('ATTENDEE', $value, $params);
+
+        return $this;
+    }
+
+    /**
+     * @param Property[] $value
+     *
+     * @return $this
+     */
+    public function setValue($value)
+    {
+        $this->attendees = $value;
+
+        return $this;
+    }
+
+    /**
+     * @return Property[]
+     */
+    public function getValue()
+    {
+        return $this->attendees;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toLines()
+    {
+        $lines = [];
+        foreach ($this->attendees as $attendee) {
+            $lines[] = $attendee->toLine();
+        }
+
+        return $lines;
+    }
+
+    /**
+     * @param string $name
+     * @param mixed  $value
+     *
+     * @throws \BadMethodCallException
+     */
+    public function setParam($name, $value)
+    {
+        throw new \BadMethodCallException('Cannot call setParam on Attendees Property');
+    }
+
+    /**
+     * @param $name
+     *
+     * @throws \BadMethodCallException
+     */
+    public function getParam($name)
+    {
+        throw new \BadMethodCallException('Cannot call getParam on Attendees Property');
+    }
+}