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WOOF :: file_from_url( String $url, String $name = "", String $dir = "", String $assume_extension = "txt" )
Downloads a file from the given URL if it has not been downloaded before, caches it to a directory specified, and returns a file object representing it.
The URL of the file to retrieve
String $name = ""
The name of the output file. If this is not specified, the function will automatically choose a name that is a hash on the URL, to guarantee its uniqueness.
String $dir = ""
An absolute directory path to download the file to. If this is not specified, a default directory will be used.
String $assume_extension = "txt"
The extension to assume if it cannot be inferred from the URL.