组合user_register 和wp_insert_post 应该可以正常工作：

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

function create_postset($user_id) {
    // userinfo
    $user_info = get_userdata($user_id);
    // Create post objects
    $post_1 = array(
        \'post_title\' => \'1st post created for \' . $user_info->user_login,
        \'post_content\' => \'Lorem Ipsum\',
        \'post_status\' => \'publish\',
        \'post_author\' => $user_id
    );
    $post_2 = array(
        \'post_title\' => \'2nd post created for \' . $user_info->user_login,
        \'post_content\' => \'Lorem Ipsum\',
        \'post_status\' => \'publish\',
        \'post_author\' => $user_id
    );

    // Insert posts into the database
    wp_insert_post($post_1);
    wp_insert_post($post_2);
}