I use Laravel Storage::putFile() when I store uploaded files and I like the convenience of it's automatic unique file name and how it takes care of file extension.
Now I want to get a file from a remote server (file_get_contents($url)) and store it like I did for uploaded files, but I don't find any equal method in the docs.
In https://laravel.com/docs/5.5/filesystem#storing-files in the put method, you have to specify the file name.
$filename = uniqid(). '.' .File::extension($file->getClientOriginalName());
//uniqid() is php function to generate uniqid but you can use time() etc.
$path = "Files/Images/"
Storage::disk('local')->put($path.$filename,file_get_contents($file));
If you have an UploadedFile instance you can also use $file->hashName()
https://laravel.com/api/5.5/Illuminate/Http/UploadedFile.html#method_hashName
https://github.com/laravel/framework/blob/5.5/src/Illuminate/Http/FileHelpers.php#L52
To be sure the filename is unique and to get the extension of your file url, you can do like this :
$ext = pathinfo($url, PATHINFO_EXTENSION);
$filename = bcrypt($url).time().'.'.$ext;