php工厂模式和工厂体系

单例模式：

class SingleIns
{
public static $_instance;
private function __construct(){}
private function __clone(){}

public static function getInstance(){
if(!(self::$_instance instanceof self)){
self::$_instance = new self();
}
return self::$_instance;
}

public function demo(){
echo demo;
}
}

define(DIR, dirname(__FILE__));
include DIR./autoload/Loader.php;
spl_autoload_register(\autoload\Loader::autoload);

$demo = \SingleIns::getInstance();
$demo->demo();

工厂模式：

interface IFactory
{
public function show();
}

class ProA implements \IFactory
{

public function __construct()
{}

public function show()
{
echo "ProA";
}
}

class ProB implements \IFactory
{

public function __construct()
{}

public function show()
{
echo "ProB";
}
}

define(DIR, dirname(__FILE__));
include DIR./autoload/Loader.php;
spl_autoload_register(\autoload\Loader::autoload);

$proA = \FactoryIns::getPro(A);
$proA->show();
$proB = \FactoryIns::getPro(B);
$proB->show();