$arr = [
"fileurl"=>"",
"uploadtype"=>"20",
"fileid"=>"*0*eO7SsKNr2PQTlqxi3TVgYeimS4KBbxDQPgKSswBv1YsngmLB4FKzVGwZhY+MTDk/bzK58bxtY59daaLuC5HNobhmZHMOtkBvNNDiQXq2c0qMtn5PWxsxYFuv40ZG3N9s9qe2X7MWN/38WIHiB771JpaaHkrdtvCzNp/V+DwwC0U+ICCXUYszimIKkf8IfD5l99vHNw/CST0TR0WdxfRDwA==",
"filesize"=>"7899640",
"filetype"=>"rar",
"filename"=>"2017.rar",
"filepath"=>"wwfile://openDocument?ftnType=20&fileId=*0*eO7SsKNr2PQTlqxi3TVgYeimS4KBbxDQPgKSswBv1YsngmLB4FKzVGwZhY%2BMTDk%2FbzK58bxtY59daaLuC5HNobhmZHMOtkBvNNDiQXq2c0qMtn5PWxsxYFuv40ZG3N9s9qe2X7MWN%2F38WIHiB771JpaaHkrdtvCzNp%2FV%2BDwwC0U%2BICCXUYszimIKkf8IfD5l99vHNw%2FCST0TR0WdxfRDwA%3D%3D&fileName=2017%E4%B8%83%E5%A4%95%E6%8E%A8%E5%B9%BF%E5%B7%A5%E5%85%B7%E5%8C%85.rar&fileSize=7899640&md5=",
"extdata"=>"{\"fileSize\":\"7899640\"}",
"isfile"=>true,
"className"=>"ww_icon_NoticeAttachmentZip",
"fileItemClassName"=>"NoticeAttachmentZip"
];
this data is returned by the other party. How to deal with this data and download this rar format file?