学习java就知道设计模式中有多例模式：
1、多例类可以有多个实例
2、多例类必须能够自我创建并管理自己的实例，并向外界提供自己的实例。
大家都知道PHP单例模式，却很少说PHP多例模式，下面是在wikipedia上看到的PHP多例模式的例子：
<?phpabstract class Multiton { /** by http://www.phpddt.com */ private static $instances = array(); public static function getInstance() { $key = get_called_class() . serialize(func_get_args()); if (!isset(self::$instances[$key])) { $rc = new ReflectionClass(get_called_class()); self::$instances[$key] = $rc->newInstanceArgs(func_get_args()); } return self::$instances[$key]; }} class Hello extends Multiton { public function __construct($string = 'World') { echo "Hello $stringn"; }} class GoodBye extends Multiton { public function __construct($string = 'my', $string2 = 'darling') { echo "Goodbye $string $string2n"; }} $a = Hello::getInstance('World');$b = Hello::getInstance('bob');// $a !== $b $c = Hello::getInstance('World');// $a === $c $d = GoodBye::getInstance();$e = GoodBye::getInstance();// $d === $e $f = GoodBye::getInstance('your');// $d !== $f ?>