When generating a CSV file with PHP in the UTF-8 encoding, Microsoft Excel freaks out. It just doesn’t show the proper encoding. Thank you Microsoft! However, I did find a way to handle this encoding and make it compatible for Windows/Microsoft Excel.
Instead of outputing with encoding of UTF-8, change it on the fly to Windows-1251. This can be accomplished with
mb_convert_encoding(). Check it out:
$csvOutput .= mb_convert_encoding(implode(',', $value), 'Windows-1251', 'UTF-8');