diff --git a/common/framework/drivers/cache/apc.php b/common/framework/drivers/cache/apc.php
new file mode 100644
index 000000000..8b23b45e9
--- /dev/null
+++ b/common/framework/drivers/cache/apc.php
@@ -0,0 +1,156 @@
+<?php
+
+namespace Rhymix\Framework\Drivers\Cache;
+
+/**
+ * The APC cache driver.
+ */
+class APC implements \Rhymix\Framework\Drivers\CacheInterface
+{
+	/**
+	 * Create a new instance of the current cache driver, using the given settings.
+	 * 
+	 * @param array $config
+	 * @return void
+	 */
+	public function __construct(array $config)
+	{
+		
+	}
+	
+	/**
+	 * Check if the current cache driver is supported on this server.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function isSupported()
+	{
+		return function_exists('apc_exists');
+	}
+	
+	/**
+	 * Validate cache settings.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param mixed $config
+	 * @return bool
+	 */
+	public function validateSettings($config)
+	{
+		return true;
+	}
+	
+	/**
+	 * Get the value of a key.
+	 * 
+	 * This method returns null if the key was not found.
+	 * 
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		$value = apc_fetch($key);
+		return $value === false ? null : $value;
+	}
+	
+	/**
+	 * Set the value to a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * $ttl is measured in seconds. If it is zero, the key should not expire.
+	 * 
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $ttl
+	 * @return bool
+	 */
+	public function set($key, $value, $ttl)
+	{
+		return apc_store($key, $value, $ttl);
+	}
+	
+	/**
+	 * Delete a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * If the key does not exist, it should return false.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function delete($key)
+	{
+		return apc_delete($key);
+	}
+	
+	/**
+	 * Check if a key exists.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return apc_exists($key);
+	}
+	
+	/**
+	 * Increase the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function incr($key, $amount)
+	{
+		$result = apc_inc($key, $amount);
+		if ($result === false)
+		{
+			apc_store($key, $amount);
+			$result = $amount;
+		}
+		return $result;
+	}
+	
+	/**
+	 * Decrease the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function decr($key, $amount)
+	{
+		$result = apc_dec($key, $amount);
+		if ($result === false)
+		{
+			apc_store($key, 0 - $amount);
+			$result = 0 - $amount;
+		}
+		return $result;
+	}
+	
+	/**
+	 * Clear all keys from the cache.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function clear()
+	{
+		return apc_clear_cache('user');
+	}
+}
diff --git a/common/framework/drivers/cache/file.php b/common/framework/drivers/cache/file.php
new file mode 100644
index 000000000..9e129286e
--- /dev/null
+++ b/common/framework/drivers/cache/file.php
@@ -0,0 +1,183 @@
+<?php
+
+namespace Rhymix\Framework\Drivers\Cache;
+
+use Rhymix\Framework\Storage;
+
+/**
+ * The file cache driver.
+ */
+class File implements \Rhymix\Framework\Drivers\CacheInterface
+{
+	/**
+	 * The cache directory.
+	 */
+	protected $_dir;
+	
+	/**
+	 * Create a new instance of the current cache driver, using the given settings.
+	 * 
+	 * @param array $config
+	 * @return void
+	 */
+	public function __construct(array $config)
+	{
+		$this->_dir = \RX_BASEDIR . 'files/cache/store';
+		if (!Storage::isDirectory($this->_dir))
+		{
+			Storage::createDirectory($this->_dir);
+		}
+	}
+	
+	/**
+	 * Check if the current cache driver is supported on this server.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function isSupported()
+	{
+		return true;
+	}
+	
+	/**
+	 * Validate cache settings.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param mixed $config
+	 * @return bool
+	 */
+	public function validateSettings($config)
+	{
+		return true;
+	}
+	
+	/**
+	 * Get the value of a key.
+	 * 
+	 * This method returns null if the key was not found.
+	 * 
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		$filename = $this->_getFilename($key);
+		$data = Storage::readPHPData($filename);
+		
+		if ($data === false)
+		{
+			return null;
+		}
+		elseif (!is_array($data) || count($data) < 2 || ($data[0] > 0 && $data[0] < time()))
+		{
+			Storage::delete($filename);
+			return null;
+		}
+		else
+		{
+			return $data[1];
+		}
+	}
+	
+	/**
+	 * Set the value to a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * $ttl is measured in seconds. If it is zero, the key should not expire.
+	 * 
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $ttl
+	 * @return bool
+	 */
+	public function set($key, $value, $ttl)
+	{
+		return Storage::writePHPData($this->_getFilename($key), array($ttl ? (time() + $ttl) : 0, $value));
+	}
+	
+	/**
+	 * Delete a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * If the key does not exist, it should return false.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function delete($key)
+	{
+		return Storage::delete($this->_getFilename($key));
+	}
+	
+	/**
+	 * Check if a key exists.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return $this->get($key) !== null;
+	}
+	
+	/**
+	 * Increase the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function incr($key, $amount)
+	{
+		$value = intval($this->get($key));
+		$success = $this->set($key, $value + $amount);
+		return $success ? ($value + $amount) : false;
+	}
+	
+	/**
+	 * Decrease the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function decr($key, $amount)
+	{
+		return $this->incr($key, 0 - $amount);
+	}
+	
+	/**
+	 * Clear all keys from the cache.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function clear()
+	{
+		Storage::deleteDirectory($this->_dir);
+	}
+	
+	/**
+	 * Get the filename to store a key.
+	 * 
+	 * @param string $key
+	 * @return string
+	 */
+	protected function _getFilename($key)
+	{
+		$hash = sha1($key);
+		return $this->_dir . '/' . substr($hash, 0, 2) . '/' . substr($hash, 2, 2) . '/' . $hash . '.php';
+	}
+}
diff --git a/common/framework/drivers/cache/memcached.php b/common/framework/drivers/cache/memcached.php
new file mode 100644
index 000000000..08eb54760
--- /dev/null
+++ b/common/framework/drivers/cache/memcached.php
@@ -0,0 +1,228 @@
+<?php
+
+namespace Rhymix\Framework\Drivers\Cache;
+
+/**
+ * The Memcached cache driver.
+ */
+class Memcached implements \Rhymix\Framework\Drivers\CacheInterface
+{
+	/**
+	 * The Memcached connection is stored here.
+	 */
+	protected $_conn = null;
+	protected $_ext = null;
+	
+	/**
+	 * Create a new instance of the current cache driver, using the given settings.
+	 * 
+	 * @param array $config
+	 * @return void
+	 */
+	public function __construct(array $config)
+	{
+		if (class_exists('\\Memcached'))
+		{
+			$this->_conn = new \Memcached;
+			$this->_ext = 'Memcached';
+		}
+		elseif (class_exists('\\Memcache'))
+		{
+			$this->_conn = new \Memcache;
+			$this->_ext = 'Memcache';
+		}
+		else
+		{
+			return;
+		}
+		
+		foreach ($config as $url)
+		{
+			$info = parse_url($url);
+			if (isset($info['host']) && isset($info['port']))
+			{
+				$this->_conn->addServer($info['host'], $info['port']);
+			}
+		}
+	}
+	
+	/**
+	 * Check if the current cache driver is supported on this server.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function isSupported()
+	{
+		return class_exists('\\Memcached') || class_exists('\\Memcache');
+	}
+	
+	/**
+	 * Validate cache settings.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param mixed $config
+	 * @return bool
+	 */
+	public function validateSettings($config)
+	{
+		if (class_exists('\\Memcached'))
+		{
+			$conn = new \Memcached;
+			$ext = 'Memcached';
+		}
+		elseif (class_exists('\\Memcache'))
+		{
+			$conn = new \Memcache;
+			$ext = 'Memcache';
+		}
+		else
+		{
+			return false;
+		}
+		
+		foreach ($config as $url)
+		{
+			$info = parse_url($url);
+			if (isset($info['host']) && isset($info['port']))
+			{
+				$conn->addServer($info['host'], $info['port']);
+			}
+		}
+		
+		for ($i = 0; $i < 5; $i++)
+		{
+			$key = 'rhymix:test:' . md5($i);
+			$status = ($ext === 'Memcached') ? $conn->set($key, $i, 2) : $conn->set($key, $i, 0, 2);
+			if (!$status) return false;
+		}
+		return true;
+	}
+	
+	/**
+	 * Get the value of a key.
+	 * 
+	 * This method returns null if the key was not found.
+	 * 
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		$value = $this->_conn->get($key);
+		if ($value === false)
+		{
+			return null;
+		}
+		else
+		{
+			return $value;
+		}
+	}
+	
+	/**
+	 * Set the value to a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * $ttl is measured in seconds. If it is zero, the key should not expire.
+	 * 
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $ttl
+	 * @return bool
+	 */
+	public function set($key, $value, $ttl)
+	{
+		if ($this->_ext === 'Memcached')
+		{
+			return $this->_conn->set($key, $value, $ttl);
+		}
+		else
+		{
+			return $this->_conn->set($key, $value, MEMCACHE_COMPRESSED, $ttl);
+		}
+	}
+	
+	/**
+	 * Delete a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * If the key does not exist, it should return false.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function delete($key)
+	{
+		return $this->_conn->delete($key);
+	}
+	
+	/**
+	 * Check if a key exists.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return $this->_conn->get($key) !== false;
+	}
+	
+	/**
+	 * Increase the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function incr($key, $amount)
+	{
+		$result = $this->_conn->increment($key, $amount);
+		if ($result === false)
+		{
+			$this->set($key, $amount);
+			$result = $amount;
+		}
+		return $result;
+	}
+	
+	/**
+	 * Decrease the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function decr($key, $amount)
+	{
+		$result = $this->_conn->decrement($key, $amount);
+		if ($result === false)
+		{
+			$this->set($key, 0 - $amount);
+			$result = 0 - $amount;
+		}
+		return $result;
+	}
+	
+	/**
+	 * Clear all keys from the cache.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function clear()
+	{
+		return $this->_conn->flush();
+	}
+}
diff --git a/common/framework/drivers/cache/redis.php b/common/framework/drivers/cache/redis.php
new file mode 100644
index 000000000..de304c853
--- /dev/null
+++ b/common/framework/drivers/cache/redis.php
@@ -0,0 +1,259 @@
+<?php
+
+namespace Rhymix\Framework\Drivers\Cache;
+
+/**
+ * The Redis cache driver.
+ */
+class Redis implements \Rhymix\Framework\Drivers\CacheInterface
+{
+	/**
+	 * The Redis connection is stored here.
+	 */
+	protected $_conn = null;
+	
+	/**
+	 * Create a new instance of the current cache driver, using the given settings.
+	 * 
+	 * @param array $config
+	 * @return void
+	 */
+	public function __construct(array $config)
+	{
+		try
+		{
+			$this->_conn = new \Redis;
+			foreach ($config as $url)
+			{
+				$info = parse_url($url);
+				if (isset($info['host']) && isset($info['port']))
+				{
+					$this->_conn->connect($info['host'], $info['port'], 0.15);
+					if(isset($info['user']) || isset($info['pass']))
+					{
+						$this->_conn->auth(isset($info['user']) ? $info['user'] : $info['pass']);
+					}
+					if(isset($info['path']) && $dbnum = intval(substr($info['path'], 1)))
+					{
+						$this->_conn->select($dbnum);
+					}
+					break;
+				}
+			}
+			$this->_conn = null;
+		}
+		catch (\RedisException $e)
+		{
+			$this->_conn = null;
+		}
+	}
+	
+	/**
+	 * Check if the current cache driver is supported on this server.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function isSupported()
+	{
+		return class_exists('\\Redis');
+	}
+	
+	/**
+	 * Validate cache settings.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param mixed $config
+	 * @return bool
+	 */
+	public function validateSettings($config)
+	{
+		try
+		{
+			$conn = new \Redis;
+			foreach ($config as $url)
+			{
+				$info = parse_url($url);
+				if (isset($info['host']) && isset($info['port']))
+				{
+					$conn->connect($info['host'], $info['port'], 0.15);
+					if(isset($info['user']) || isset($info['pass']))
+					{
+						$conn->auth(isset($info['user']) ? $info['user'] : $info['pass']);
+					}
+					if(isset($info['path']) && $dbnum = intval(substr($info['path'], 1)))
+					{
+						$conn->select($dbnum);
+					}
+					return true;
+				}
+			}
+			return false;
+		}
+		catch (\RedisException $e)
+		{
+			return false;
+		}
+	}
+	
+	/**
+	 * Get the value of a key.
+	 * 
+	 * This method returns null if the key was not found.
+	 * 
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		try
+		{
+			$value = $this->_conn->get($key);
+		}
+		catch (\RedisException $e)
+		{
+			return null;
+		}
+		
+		if ($value === false)
+		{
+			return null;
+		}
+		
+		$value = unserialize($value);
+		if ($value === false)
+		{
+			return null;
+		}
+		return $value;
+	}
+	
+	/**
+	 * Set the value to a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * $ttl is measured in seconds. If it is zero, the key should not expire.
+	 * 
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $ttl
+	 * @return bool
+	 */
+	public function set($key, $value, $ttl)
+	{
+		try
+		{
+			return $this->_conn->setex($key, $ttl, serialize($value)) ? true : false;
+		}
+		catch (\RedisException $e)
+		{
+			return false;
+		}
+	}
+	
+	/**
+	 * Delete a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * If the key does not exist, it should return false.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function delete($key)
+	{
+		try
+		{
+			return $this->_conn->del($key) ? true : false;
+		}
+		catch (\RedisException $e)
+		{
+			return false;
+		}
+	}
+	
+	/**
+	 * Check if a key exists.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		try
+		{
+			return $this->_conn->exists($key);
+		}
+		catch (\RedisException $e)
+		{
+			return false;
+		}
+	}
+	
+	/**
+	 * Increase the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function incr($key, $amount)
+	{
+		try
+		{
+			return $this->_conn->incrBy($key, $amount);
+		}
+		catch (\RedisException $e)
+		{
+			return false;
+		}
+	}
+	
+	/**
+	 * Decrease the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function decr($key, $amount)
+	{
+		try
+		{
+			return $this->_conn->decrBy($key, $amount);
+		}
+		catch (\RedisException $e)
+		{
+			return false;
+		}
+	}
+	
+	/**
+	 * Clear all keys from the cache.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function clear()
+	{
+		try
+		{
+			return $this->_conn->flushDB() ? true : false;
+		}
+		catch (\RedisException $e)
+		{
+			return false;
+		}
+	}
+}
diff --git a/common/framework/drivers/cache/wincache.php b/common/framework/drivers/cache/wincache.php
new file mode 100644
index 000000000..769343298
--- /dev/null
+++ b/common/framework/drivers/cache/wincache.php
@@ -0,0 +1,156 @@
+<?php
+
+namespace Rhymix\Framework\Drivers\Cache;
+
+/**
+ * The WinCache cache driver.
+ */
+class WinCache implements \Rhymix\Framework\Drivers\CacheInterface
+{
+	/**
+	 * Create a new instance of the current cache driver, using the given settings.
+	 * 
+	 * @param array $config
+	 * @return void
+	 */
+	public function __construct(array $config)
+	{
+		
+	}
+	
+	/**
+	 * Check if the current cache driver is supported on this server.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function isSupported()
+	{
+		return function_exists('wincache_ucache_get');
+	}
+	
+	/**
+	 * Validate cache settings.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param mixed $config
+	 * @return bool
+	 */
+	public function validateSettings($config)
+	{
+		return true;
+	}
+	
+	/**
+	 * Get the value of a key.
+	 * 
+	 * This method returns null if the key was not found.
+	 * 
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		$value = wincache_ucache_get($key, $success);
+		return $success ? $value : null;
+	}
+	
+	/**
+	 * Set the value to a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * $ttl is measured in seconds. If it is zero, the key should not expire.
+	 * 
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $ttl
+	 * @return bool
+	 */
+	public function set($key, $value, $ttl)
+	{
+		return wincache_ucache_set($key, $value, $ttl);
+	}
+	
+	/**
+	 * Delete a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * If the key does not exist, it should return false.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function delete($key)
+	{
+		return wincache_ucache_delete($key);
+	}
+	
+	/**
+	 * Check if a key exists.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return wincache_ucache_exists($key);
+	}
+	
+	/**
+	 * Increase the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function incr($key, $amount)
+	{
+		$result = wincache_ucache_inc($key, $amount);
+		if ($result === false)
+		{
+			wincache_ucache_set($key, $amount);
+			$result = $amount;
+		}
+		return $result;
+	}
+	
+	/**
+	 * Decrease the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function decr($key, $amount)
+	{
+		$result = wincache_ucache_dec($key, $amount);
+		if ($result === false)
+		{
+			wincache_ucache_set($key, 0 - $amount);
+			$result = 0 - $amount;
+		}
+		return $result;
+	}
+	
+	/**
+	 * Clear all keys from the cache.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function clear()
+	{
+		return wincache_ucache_clear();
+	}
+}
diff --git a/common/framework/drivers/cache/xcache.php b/common/framework/drivers/cache/xcache.php
new file mode 100644
index 000000000..9f9cd850a
--- /dev/null
+++ b/common/framework/drivers/cache/xcache.php
@@ -0,0 +1,145 @@
+<?php
+
+namespace Rhymix\Framework\Drivers\Cache;
+
+/**
+ * The XCache cache driver.
+ */
+class XCache implements \Rhymix\Framework\Drivers\CacheInterface
+{
+	/**
+	 * Create a new instance of the current cache driver, using the given settings.
+	 * 
+	 * @param array $config
+	 * @return void
+	 */
+	public function __construct(array $config)
+	{
+		
+	}
+	
+	/**
+	 * Check if the current cache driver is supported on this server.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function isSupported()
+	{
+		return function_exists('xcache_get');
+	}
+	
+	/**
+	 * Validate cache settings.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param mixed $config
+	 * @return bool
+	 */
+	public function validateSettings($config)
+	{
+		return true;
+	}
+	
+	/**
+	 * Get the value of a key.
+	 * 
+	 * This method returns null if the key was not found.
+	 * 
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		$value = xcache_get($key);
+		return $value === false ? null : $value;
+	}
+	
+	/**
+	 * Set the value to a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * $ttl is measured in seconds. If it is zero, the key should not expire.
+	 * 
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $ttl
+	 * @return bool
+	 */
+	public function set($key, $value, $ttl)
+	{
+		return xcache_set($key, $value, $ttl);
+	}
+	
+	/**
+	 * Delete a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * If the key does not exist, it should return false.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function delete($key)
+	{
+		return xcache_unset($key);
+	}
+	
+	/**
+	 * Check if a key exists.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return xcache_isset($key);
+	}
+	
+	/**
+	 * Increase the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function incr($key, $amount)
+	{
+		return xcache_inc($key, $amount);
+	}
+	
+	/**
+	 * Decrease the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function decr($key, $amount)
+	{
+		return xcache_dec($key, $amount);
+	}
+	
+	/**
+	 * Clear all keys from the cache.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function clear()
+	{
+		xcache_clear_cache(XC_TYPE_VAR);
+		return true;
+	}
+}