这里定义图片的增删改查trait类

trait HandlePicture
{
    protected static $path = "C:/www";

    private static function add(): string//增
    {
        return self::$add;
    }

    public static function delete(): string//删
    {
        return self::$delete;
    }

    public static function update(): string//改
    {
        return self::$update;
    }

    public static function get(): string//查
    {
        return self::$get;
    }
}

引入图片的trait类

class DB
{
    use HandlePicture;

    public static $add = 'add';

    public static $delete = 'delete';

    public static $update = 'update';

    public static $get = 'get';

    public function __construct(){}

    public function __clone(){}
    
    public function addPicture()
    {
        echo self::add();
    }
}
$addPicture = new DB();//实例化DB类
$addPicture->addPicture();//调用函数