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CodeIgniter URL

CodeIgniter URLs are SEO friendly. Instead of using a 'query-string' approach, it uses a segment-based approach.

Basic URL structure

class represents controller class that needs to be invoked.

function is the method that is called.

ID is any additional segment that is passed to controllers.

What is site_url();

You can pass a string or an array in a site_url() function. In this example we'll pass a string,

echo site_url('book/novel/fiction');

The above function will return something like this

In this example we'll pass an array,

$data = array('book', 'novel', 'fiction');

echo site_url($data);

What is base_url();

It returns your site base URL, if mentioned any, in the config file. On passing base_url(), it also returns the same thing as site_url() with eliminating index.php. This is useful because here you can also pass images or text files. Here also you can pass a string or an array.

In this example we'll pass a string,

echo base_url("book/novel/fiction");

The above function will return something like this book/novel/fiction

What is uri_string();

It returns the URI segment of a page. For example, if your URL is,

Then, uri_string() will return


What is current_url();

Calling this function means, it will return the full URL of the page currently viewed.

Please note -> calling this function is same as calling uri_string() in site_url().

current_url() = site_url(uri_string());

What is index_page();

It will return your site's index_page which you have mentioned in your config file. By default, it is always index.php file.

You can change it with the help of .htaccess file.


It creates a standard HTML link based on your local site URL. For example,

Echo anchor('book/novel/fiction', 'My Collection, 'title="book name");

It will give the following result,

My Collection


It is identical to anchor() but it opens the URL in a new window.


It creates a HTML email link. For example,

Echo mailto('', 'To contact me click here')


It takes a string as an input and creates a human friendly environment. For example,

$title = "CodeIgniter's examples"
$url_title() = url_title($title);

Output will be "CodeIgniters-examples"

If you'll pass a second parameter, it defines word delimiter.

$title = "CodeIgniter's examples"
$url_title() = url_title($title, '_');

Output will be "CodeIgniters_examples"

If you'll pass a third parameter, it defines uppercase and lowercase. You have Boolean options for this, TRUE/FALSE.

$title = "CodeIgniter's examples"
$url_title() = url_title($title, '_', TRUE);

Output will be "codeigniters_examples"

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