relocate the cache class

Zotlabs/Lib/Cache.php

@@ -0,0 +1,46 @@
+<?php /** @file */
+
+namespace Zotlabs\Lib;
+
+	/**
+	 *  cache api
+	 */
+	 
+class Cache {
+	public static function get($key) {
+		$r = q("SELECT v FROM cache WHERE k = '%s' limit 1",
+			dbesc($key)
+		);
+			
+		if ($r)
+			return $r[0]['v'];
+		return null;
+	}
+		
+	public static function set($key,$value) {
+
+		$r = q("SELECT * FROM cache WHERE k = '%s' limit 1",
+			dbesc($key)
+		);
+		if($r) {
+			q("UPDATE cache SET v = '%s', updated = '%s' WHERE k = '%s'",
+				dbesc($value),
+				dbesc(datetime_convert()),
+				dbesc($key));
+		}
+		else {
+			q("INSERT INTO cache ( k, v, updated) VALUES ('%s','%s','%s')",
+				dbesc($key),
+				dbesc($value),
+				dbesc(datetime_convert()));
+		}
+	}
+
+		
+	public static function clear() {
+		q("DELETE FROM cache WHERE updated < '%s'",
+			dbesc(datetime_convert('UTC','UTC',"now - 30 days")));			
+	}
+		
+}
+