您应该可以为此使用file_get_contents.为了在file_get_contents中使用URL，请确保在php.ini文件中启用了allow_url_fopen.

You should be able to use file_get_contents for this one. In order to use an URL with file_get_contents make sure allow_url_fopen is enabled in you php.ini file.

define('DIRECTORY', '/home/user/uploads');

$content = file_get_contents('http://anothersite/images/goods.jpg');
file_put_contents(DIRECTORY . '/image.jpg', $content);

确保对要存储图像的目录具有写权限；要使该文件夹可写，您可以执行以下操作:

Make sure that you have write permission to the directory where you want to store the image; to make the folder writable you could do this:

chmod +w /home/users/uploads

参考

1. file_get_contents
2. allow_url_fopen
3. chmod命令

1. file_get_contents
2. allow_url_fopen
3. chmod command