我不知道这对你有多大帮助，但你可能想看看干预图书馆。它原本打算用作图像处理库，但它提供了来自网址的保存图像：

I don't know if this will help you a lot but you might want to look at the Intervention Library. It's originally intended to be used as an image manipulation library but it provides saving image from url:

$image = Image::make('http://someurl.com/image.jpg')->save('/path/saveAsImageName.jpg');