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/**
 * Description:单例模式链接数据库
 * Author: wangyongdong
 * DateTime: 2019/1/28 16:04
 */
class DBa {
    protected $_instance = null;

    public function __construct()
    {
        return new DBa();
    }

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

    public function __clone()
    {
        // TODO: Implement __clone() method.
    }
}