public static function main(array $args = array())
{
$boiler = ChocolateBoiler::getInstance();
$boiler->fill();
$boiler->boil();
$boiler->drain();
// will return the existing instance
$boiler2 = ChocolateBoiler::getInstance();
}
public static function getInstance()
{
if (self::$uniqueInstance == NULL) {
println("Creating unique instance of Chocolate Boiler");
self::$uniqueInstance = new ChocolateBoiler();
}
println("Returning instance of Chocolate Boiler");
return self::$uniqueInstance;
}