[ticket/16955] Add stubs for cache classes and clean up

PHPBB3-16955

build/psalm/stubs/apcu/apcu.php

@@ -0,0 +1,24 @@
+<?php
+
+class APCUIterator implements Iterator
+{
+	public function current()
+	{
+	}
+
+	public function next()
+	{
+	}
+
+	public function key()
+	{
+	}
+
+	public function valid()
+	{
+	}
+
+	public function rewind()
+	{
+	}
+}

build/psalm/stubs/memcached/memcached.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+/** @link https://www.php.net/manual/en/memcached.constants.php */
+class Memcached
+{
+	public const OPT_COMPRESSION = -1001;
+
+	public const OPT_BINARY_PROTOCOL = 18;
+}

build/psalm/stubs/redis/redis.php

@@ -0,0 +1,21 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+/** @link https://phpredis.github.io/phpredis/Redis.html */
+class Redis
+{
+	public const OPT_PREFIX = 2;
+
+	public const SERIALIZER_PHP = 1;
+
+}

build/psalm/stubs/sqlite3/sqlite3.php

@@ -10,6 +10,7 @@
  * the docs/CREDITS.txt file.
  *
  */
+
 class SQLite3
 {
 	public function query(string $query) {}