基本URL

Returns your site base URL,as specified in your config file. Example:
echo base_url();

This function returns the same thing as site_url,without the
index_page or url_suffix being appended.

Also like site_url,you can supply segments as a string or an array.
Here is a string example: echo base_url(“blog/post/123”);

网站网址

Returns your site URL,as specified in your config file. The index.PHP
file (or whatever you have set as your site index_page in your config
file) will be added to the URL,as will any URI segments you pass to
the function,and the url_suffix as set in your config file.

You are encouraged to use this function any time you need to generate
a local URL so that your pages become more portable in the event your
URL changes.

Segments can be optionally passed to the function as a string or an
array. Here is a string example: echo site_url(“news/local/123”);

The above example would return something like:
07001

Here is an example of segments passed as an array: $segments =
array(‘news’,‘local’,‘123’);

echo site_url($segments);