New database system that uses PDO if present/Test script for doing database upgrades.

library/dddbl2/inc/Singleton.class.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace DDDBL;
+
+/**
+  * simple implementation of generic singleton
+  * for all classes, which allows additional instances
+  * if needed
+  *
+  **/
+  
+class Singleton {
+
+  /**
+    * @param $strClass - the class we want an instance from
+    *
+    * @throws UnexpectedParameterTypeException - if given parameter is not a string
+    * @throws \Exception                       - if given class do not exists
+    *
+    * @return (object) - an instance of the given classname
+    *
+    * get a reference to the instance of the given class.
+    * if instance do not exists, create one. after creation
+    * always return reference to this reference
+    *
+    **/
+  static function getInstance($strClass) {
+  
+    if(!is_string($strClass))
+      throw new UnexpectedParameterTypeException('string', $strClass);
+    
+    if(!class_exists($strClass))
+      throw new \Exception ("class do not exists: $strClass");
+    
+    static $arrObjectList = array();
+    
+    if(!isset($arrObjectList[$strClass]))
+      $arrObjectList[$strClass] = new $strClass();
+    
+    return $arrObjectList[$strClass];
+  
+  }
+
+}