tweaked cache and session namespacing.

system/cache/file.php

@@ -0,0 +1,66 @@
+<?php namespace System\Cache;
+
+class File implements Driver {
+
+	/**
+	 * Determine if an item exists in the cache.
+	 *
+	 * @param  string  $key
+	 * @return bool
+	 */
+	public function has($key)
+	{
+		return ( ! is_null($this->get($key)));
+	}
+
+	/**
+	 * Get an item from the cache.
+	 *
+	 * @param  string  $key
+	 * @param  mixed   $default
+	 * @return mixed
+	 */	
+	public function get($key)
+	{
+		if ( ! file_exists(CACHE_PATH.$key))
+		{
+			return null;
+		}
+
+		$cache = file_get_contents(CACHE_PATH.$key);
+
+		if (time() >= substr($cache, 0, 10))
+		{
+			$this->forget($key);
+
+			return null;
+		}
+
+		return unserialize(substr($cache, 10));
+	}
+
+	/**
+	 * Write an item to the cache.
+	 *
+	 * @param  string  $key
+	 * @param  mixed   $value
+	 * @param  int     $minutes
+	 * @return void
+	 */
+	public function put($key, $value, $minutes)
+	{
+		file_put_contents(CACHE_PATH.$key, (time() + ($minutes * 60)).serialize($value), LOCK_EX);
+	}
+
+	/**
+	 * Delete an item from the cache.
+	 *
+	 * @param  string  $key
+	 * @return void
+	 */
+	public function forget($key)
+	{
+		@unlink(CACHE_PATH.$key);
+	}
+
+}