diff --git a/include/cache.php b/include/cache.php
deleted file mode 100644
index 6bdb3e2f66..0000000000
--- a/include/cache.php
+++ /dev/null
@@ -1,211 +0,0 @@
-<?php
-/**
- * @file include/cache.php
- *
- * @brief Class for storing data for a short time
- */
-
-use Friendica\Core\Config;
-use Friendica\Core\PConfig;
-use Friendica\Database\DBM;
-
-class Cache {
-	/**
-	 * @brief Check for memcache and open a connection if configured
-	 *
-	 * @return object|boolean The memcache object - or "false" if not successful
-	 */
-	public static function memcache() {
-		if (!function_exists('memcache_connect')) {
-			return false;
-		}
-
-		if (!Config::get('system', 'memcache')) {
-			return false;
-		}
-
-		$memcache_host = Config::get('system', 'memcache_host', '127.0.0.1');
-		$memcache_port = Config::get('system', 'memcache_port', 11211);
-
-		$memcache = new Memcache;
-
-		if (!$memcache->connect($memcache_host, $memcache_port)) {
-			return false;
-		}
-
-		return $memcache;
-	}
-
-	/**
-	 * @brief Return the duration for a given cache level
-	 *
-	 * @param integer $level Cache level
-	 *
-	 * @return integer The cache duration in seconds
-	 */
-	private static function duration($level) {
-		switch($level) {
-			case CACHE_MONTH;
-				$seconds = 2592000;
-				break;
-			case CACHE_WEEK;
-				$seconds = 604800;
-				break;
-			case CACHE_DAY;
-				$seconds = 86400;
-				break;
-			case CACHE_HOUR;
-				$seconds = 3600;
-				break;
-			case CACHE_HALF_HOUR;
-				$seconds = 1800;
-				break;
-			case CACHE_QUARTER_HOUR;
-				$seconds = 900;
-				break;
-			case CACHE_FIVE_MINUTES;
-				$seconds = 300;
-				break;
-			case CACHE_MINUTE;
-				$seconds = 60;
-				break;
-		}
-		return $seconds;
-	}
-
-	/**
-	 * @brief Fetch cached data according to the key
-	 *
-	 * @param string $key The key to the cached data
-	 *
-	 * @return mixed Cached $value or "null" if not found
-	 */
-	public static function get($key) {
-
-		$memcache = self::memcache();
-		if (is_object($memcache)) {
-			// We fetch with the hostname as key to avoid problems with other applications
-			$cached = $memcache->get(get_app()->get_hostname().":".$key);
-			$value = @unserialize($cached);
-
-			// Only return a value if the serialized value is valid.
-			// We also check if the db entry is a serialized
-			// boolean 'false' value (which we want to return).
-			if ($cached === serialize(false) || $value !== false) {
-				return $value;
-			}
-
-			return null;
-		}
-
-		// Frequently clear cache
-		self::clear($duration);
-
-		$r = q("SELECT `v` FROM `cache` WHERE `k`='%s' LIMIT 1",
-			dbesc($key)
-		);
-
-		if (DBM::is_result($r)) {
-			$cached = $r[0]['v'];
-			$value = @unserialize($cached);
-
-			// Only return a value if the serialized value is valid.
-			// We also check if the db entry is a serialized
-			// boolean 'false' value (which we want to return).
-			if ($cached === serialize(false) || $value !== false) {
-				return $value;
-			}
-		}
-
-		return null;
-	}
-
-	/**
-	 * @brief Put data in the cache according to the key
-	 *
-	 * The input $value can have multiple formats.
-	 *
-	 * @param string $key The key to the cached data
-	 * @param mixed $valie The value that is about to be stored
-	 * @param integer $duration The cache lifespan
-	 */
-	public static function set($key, $value, $duration = CACHE_MONTH) {
-
-		// Do we have an installed memcache? Use it instead.
-		$memcache = self::memcache();
-		if (is_object($memcache)) {
-			// We store with the hostname as key to avoid problems with other applications
-			$memcache->set(get_app()->get_hostname().":".$key, serialize($value), MEMCACHE_COMPRESSED, self::duration($duration));
-			return;
-		}
-
-		/// @todo store the cache data in the same way like the config data
-		q("REPLACE INTO `cache` (`k`,`v`,`expire_mode`,`updated`) VALUES ('%s','%s',%d,'%s')",
-				dbesc($key),
-				dbesc(serialize($value)),
-				intval($duration),
-				dbesc(datetime_convert()));
-	}
-
-	/**
-	 * @brief Remove outdated data from the cache
-	 *
-	 * @param integer $maxlevel The maximum cache level that is to be cleared
-	 */
-	public static function clear($max_level = CACHE_MONTH) {
-
-		// Clear long lasting cache entries only once a day
-		if (Config::get("system", "cache_cleared_day") < time() - self::duration(CACHE_DAY)) {
-			if ($max_level == CACHE_MONTH) {
-				q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
-					dbesc(datetime_convert('UTC','UTC',"now - 30 days")), intval(CACHE_MONTH));
-			}
-
-			if ($max_level <= CACHE_WEEK) {
-				q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
-					dbesc(datetime_convert('UTC','UTC',"now - 7 days")), intval(CACHE_WEEK));
-			}
-
-			if ($max_level <= CACHE_DAY) {
-				q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
-				dbesc(datetime_convert('UTC','UTC',"now - 1 days")), intval(CACHE_DAY));
-			}
-			Config::set("system", "cache_cleared_day", time());
-		}
-
-		if (($max_level <= CACHE_HOUR) && (Config::get("system", "cache_cleared_hour")) < time() - self::duration(CACHE_HOUR)) {
-			q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
-				dbesc(datetime_convert('UTC','UTC',"now - 1 hours")), intval(CACHE_HOUR));
-
-			Config::set("system", "cache_cleared_hour", time());
-		}
-
-		if (($max_level <= CACHE_HALF_HOUR) && (Config::get("system", "cache_cleared_half_hour")) < time() - self::duration(CACHE_HALF_HOUR)) {
-			q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
-				dbesc(datetime_convert('UTC','UTC',"now - 30 minutes")), intval(CACHE_HALF_HOUR));
-
-			Config::set("system", "cache_cleared_half_hour", time());
-		}
-
-		if (($max_level <= CACHE_QUARTER_HOUR) && (Config::get("system", "cache_cleared_quarter_hour")) < time() - self::duration(CACHE_QUARTER_HOUR)) {
-			q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
-				dbesc(datetime_convert('UTC','UTC',"now - 15 minutes")), intval(CACHE_QUARTER_HOUR));
-
-			Config::set("system", "cache_cleared_quarter_hour", time());
-		}
-
-		if (($max_level <= CACHE_FIVE_MINUTES) && (Config::get("system", "cache_cleared_five_minute")) < time() - self::duration(CACHE_FIVE_MINUTES)) {
-			q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
-				dbesc(datetime_convert('UTC','UTC',"now - 5 minutes")), intval(CACHE_FIVE_MINUTES));
-
-			Config::set("system", "cache_cleared_five_minute", time());
-		}
-
-		if (($max_level <= CACHE_MINUTE) && (Config::get("system", "cache_cleared_minute")) < time() - self::duration(CACHE_MINUTE)) {
-			q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
-				dbesc(datetime_convert('UTC','UTC',"now - 1 minutes")), intval(CACHE_MINUTE));
-
-			Config::set("system", "cache_cleared_minute", time());
-		}
-	}
-}