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What is factory mode

Factory mode: Create objects of different classes based on different class names.

is a factory that produces objects of different types. Avoid using the new keyword.

It can also be understood as: changing the way to create objects

Factory pattern design requirements

Factory pattern, you can design a factory class

The factory class has a private static property used to save objects of different types

The factory class has a public static method of instantiating objects

Code:

//工厂模式（单例的）

final class Factory{
	//私有的静态的保存对象的数组属性
	static private $arr = array();
	//公共的静态的实例化对象的方法
	public static function getInstance($className){
		//判断当前类的对象是否存在
		if(!isset(self::$arr[$className])){
			self::$arr[$className] = new $className();
		}
		return self::$arr[$className];
	}
}

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