How to fix encoding in PHPExcel?

Question

phpspreadsheet

Hello, tell me please. I have a string with the name of the Excel file name, I clear it of quotes and replace the spaces with "_", display it on the screen, everything is displayed as it should be like this: "OOO_Meruriy_101217.xls", but after generating the file name in a broken encoding "ООО_Мерурий_121017.xls", I use PHPExcel library, please tell me how can I fix it? Thank you in advance.

$objWriter = new PHPExcel_Writer_Excel5($xls);
   $fileTemp = $renderable['_Own']['#value']."_".date("dmy").".xls";
   $fileTemp2 = preg_replace('/\s+/u', '_', $fileTemp);
   $filName = preg_replace('/\"/u', '', $fileTemp2);
   echo $filName;
   $objWriter->save('sites/default/Excelfille/'."$filName");

Answer 1

iconv?

Answer 2

well, you still need to learn about encoding and utf8,
start with file names in Latin - it will be easier to understand