如果在href属性中，base_url（）会给出错误的链接

Question

I just started to learn Codeigniter 3.1.7, when I encountered something strange.

My site is installed in a subdirectory domain.com/site1 , while the following happens:

<h1><?php echo base_url(); ?></h1>

This prints domain.com/site1/

<h1><a href="<?php echo base_url(); ?>">Link</a></h1>

This generates a href = domain.com/site1/domain.com/site1

How is this possible? What am I missing?

Answer 1

The url is not returned twice by base_url(). If you don't specify the protocol, the browser treats it as a relative link, automatically prefixing it with the current domain and path.

A correct example would be this:

<h1><a href="//<?php echo base_url(); ?>">Link</a></h1>

According to CodeIgniter docs, it looks like you can also pass the protocol as second argument: https://www.codeigniter.com/user_guide/helpers/url_helper.html#base_url

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Note: It's also better to use // in there, so that the SSL won't matter.

Using // is the better method in order to automatically detect which environment it's in and to stay in.

Side note: When running scripts that are meant to be run inside a secure environment, also make sure that there are no http:// references to scripts, images, css, etc., since this will contain mixed environments that some browsers will warn you about it.