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：
代码如下:
PHP
abstract class Multiton {
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
?>
abstract class Multiton {
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
?>
可以看到PHP多例模式需要getInstance()传递关键值，对于给定的关键值，PHP多例模式只会存在唯一的对象实例，PHP多例模式节省内存，确保同一个对象的多个实例不发生冲突。
原文链接：https://www.f2er.com/php/26042.html