phpmyadmin access root denied

 SET PASSWORD FOR 'root'@'localhost' = PASSWORD('your_root_password');

/* Authentication type and info */

$cfg['Servers'][$i]['auth_type'] = 'cookie';

$cfg['Servers'][$i]['user'] = 'root';

$cfg['Servers'][$i]['password'] = 'your_root_password';

$cfg['Servers'][$i]['extension'] = 'mysqli';

$cfg['Servers'][$i]['AllowNoPassword'] = true;

$cfg['Lang'] = '';