PHP多例模式

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:

<?php
abstract 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 $string\n";
}
}
 
class GoodBye extends Multiton {
public function __construct($string = 'my', $string2 = 'darling') {
echo "Goodbye $string $string2\n";
}
}
 
$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
?>
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