public function get_file_source_info($source) {
        global $USER;
        list($type, $fileid, $filename) = $this->split_part($source);
        return 'Box ('. fullname($USER) . '): ' . $filename;
    }
public function get_file_source_info($source) {
        global $USER;
        list($type, $fileid, $filename) = $this->split_part($source);
        return 'Box ('. fullname($USER) . '): ' . $filename;
    }
public function get_file_source_info ( $ source ) { global $ USER ; list ( $ type , $ fileid , $ filename ) = $ this -> split_part ( $ source ) ; return 'Box (' . fullname ( $ USER ) . '): ' . $ filename ; }
Return the source information.

@param string $source Not the reference, just the source.
@return string|null
Return the source information .