从url保存为.xlsb文件到.xls

Question

I have a file .xlsb from url, I use this code to download it and save it to .xls file

$filename = 'public/files/savedfile.xls';
file_put_contents($filename, fopen($url, 'r'));

But it didn't correct format even though it was saved .xls file (correct extension). And when I use phpexcel to read it, phpexcel return an error:

 [ErrorException]
 DOMDocument::loadHTML(): Invalid char in CDATA 0x3 in Entity, line: 1

How can I Save As this file from url to .xls file (correct extension and format).

P/s: url file here