I don't know if it's a bug or something but whenever i tried to export a database using phpmyadmin in google chrome using windows 10 pro x64, it always told me that there are missing parameter in export.php: what & export_type. I also tried the solution 'make $cfg['PmaAbsoluteUri'] empty' but still not working. I tried to export using firefox and it works but with google chrome it doesn't.