More robust author import

// Set up the author
if($ablog['author'] == '0') {
    // Try the original author
    $author = $item->get_author();
    if(!empty($author)) {
        $author = $author->get_name();
    }
    $result = get_user_by('login', $author);
    if($result == false){
        $result = get_users(array('search'=>$author, 'number'=>1)); //search users by email address, URL, ID or username
        if(is_array($result) && count($result)){
            $result = $result[0];
            if(!isset($result->ID)){
                $result = false;
            }
        }
    }
    if($result == false){ //Search (manually) for display_name and user_nicename
        $blogusers = get_users(array('fields' => array('ID','user_nicename','display_name')));
        foreach ($blogusers as $user){
            if((strcasecmp($user->user_nicename, $author) == 0) || (strcasecmp($user->display_name, $author) == 0)){
                $result = $user;
                break;
            }
        }
    }
    if($result != false && isset($result->ID)){
        $author = $result->ID;
    } else {
        $author = $ablog['altauthor'];
    }
} else {
    // Use a different author
    $author = $ablog['author'];
}