你已经自己回答了这个问题，

创建一个将创建3个帖子的函数，例如：

function create_new_user_posts($user_id){
        if (!$user_id>0)
                return;
        //here we know the user has been created so to create 
        //3 posts we call wp_insert_post 3 times.
        // Create post object
        $my_bio_post = array(
             \'post_title\' => \'bio\',
             \'post_content\' => \'This is my post.\',
             \'post_status\' => \'publish\',
             \'post_author\' => $user_id
        );

        // Insert the post into the database
        $bio = wp_insert_post( $my_bio_post );
        $my_portfolio_post = array(
             \'post_title\' => \'portfolio\',
             \'post_content\' => \'This is my post.\',
             \'post_status\' => \'publish\',
             \'post_author\' => $user_id
        );

        // Insert the post into the database
        $portfolio = wp_insert_post( $my_portfolio_post );
        $my_contact_post = array(
             \'post_title\' => \'bio\',
             \'post_content\' => \'This is my post.\',
             \'post_status\' => \'publish\',
             \'post_author\' => $user_id
        );

        // Insert the post into the database
        $contact = wp_insert_post( $my_contact_post );

        //and if you want to store the post ids in 
        //the user meta then simply use update_user_meta
        update_user_meta($user_id,\'_bio_post\',$bio);
        update_user_meta($user_id,\'_portfolio_post\',$portfolio);
        update_user_meta($user_id,\'_contact_post\',$contact);
}

然后使用user_register 钩

add_action(\'user_register\',\'create_new_user_posts\');

Update当您将函数挂接到user_register 该函数接收用户id，以便您可以使用该id获取有关该用户的任何信息，例如：

$user = get_user_by(\'id\', $user_id);

现在$user是一个用户对象，因此您可以将帖子标题更改为user用户信息，例如：

\'post_title\' => $user->user_firstname . " ". $user->user_lastname . \'bio\'