echo site_url('news/local/123');
上文的事例返回的地址如下: http://example.com/index.php/news/local/123

echo base_url("blog/post/123");
上文事例返回的地址如下: http://example.com/blog/post/123



--------------
1、

https://blog.csdn.net/yaoguoxing/article/details/106581903?spm=1001.2014.3001.5502

2Codeigniter 4基础教程（2）-- 版本差异，模板,一个form例子
https://blog.csdn.net/yaoguoxing/article/details/106584296?spm=1001.2014.3001.5502

Codeigniter 4基础教程（3）-- url，bootstrap,routes
https://blog.csdn.net/yaoguoxing/article/details/106587203?spm=1001.2014.3001.5502

Codeigniter 4 基础教程（5）-- 文件上传小例子
https://blog.csdn.net/yaoguoxing/article/details/106602025?spm=1001.2014.3001.5502

Codeigniter 4基础教程（6）-- Model部分
https://blog.csdn.net/yaoguoxing/article/details/106600607?spm=1001.2014.3001.5502
Codeigniter 4基础教程（8）-- 一个简单的博客（blog）例子(一)

https://blog.csdn.net/yaoguoxing/article/details/106616551?spm=1001.2014.3001.5502