Moved cache drivers outside core to extensions (plugins)

plugins/cache-apcu/APCU.php

@@ -0,0 +1,61 @@
+<?php
+
+/*
+ * This file is part of MailSo.
+ *
+ * (c) 2014 Usenko Timur
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace MailSo\Cache\Drivers;
+
+/**
+ * @category MailSo
+ * @package Cache
+ * @subpackage Drivers
+ */
+class APCU implements \MailSo\Cache\DriverInterface
+{
+	private string $sKeyPrefix;
+
+	public function setPrefix(string $sKeyPrefix) : void
+	{
+		$sKeyPrefix = \rtrim(\trim($sKeyPrefix), '\\/');
+		$this->sKeyPrefix = empty($sKeyPrefix)
+			? $sKeyPrefix
+			: \preg_replace('/[^a-zA-Z0-9_]/', '_', $sKeyPrefix).'/';
+	}
+
+	public function Set(string $sKey, string $sValue) : bool
+	{
+		return \apcu_store($this->generateCachedKey($sKey), (string) $sValue);
+	}
+
+	public function Exists(string $sKey) : bool
+	{
+		return \apcu_exists($this->generateCachedKey($sKey));
+	}
+
+	public function Get(string $sKey) : ?string
+	{
+		$sValue = \apcu_fetch($this->generateCachedKey($sKey));
+		return \is_string($sValue) ? $sValue : null;
+	}
+
+	public function Delete(string $sKey) : void
+	{
+		\apcu_delete($this->generateCachedKey($sKey));
+	}
+
+	public function GC(int $iTimeToClearInHours = 24) : bool
+	{
+		return (0 === $iTimeToClearInHours) ? \apcu_clear_cache('user') : false;
+	}
+
+	private function generateCachedKey(string $sKey) : string
+	{
+		return $this->sKeyPrefix.\sha1($sKey);
+	}
+}