Get post author name – WordPress

While working with wordpress, you might want to do something with the post author. Here is how to get the author name:

$postAuthor = $post->post_author;
//$postAuthor have the Author Id now

$curauth    = get_userdata(intval($postAuthor));
$authName = $curauth->user_login;

//$authName is the author name of the post