PHP 之设计模式学习笔记 - 单例模式（自用）

目的：
节约资源，避免浪费资源
实现：
构造方法私有化

class Test
{protected static $type;/*** Factory constructor.*/private function __construct(){}/*** 静态方法实现私有化* @return Factory*/public static function getData(){if (self::$type) {return self::$type;}else{self::$type = new self();return self::$type;}}/*** @param $type* @return mixed*/public function addData($type){return $type;}
}

调用：

$factory = Test::getData();
$bicycle = $factory->addData("bicycle"); //调用类中方法
$bicycle = $factory::createClassName();//调用类中非静态方法