CodeIgniter Route Configuration

Key Architecture Takeaways

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  Point 1: Full-stack architecture blueprint: CodeIgniter Route Configuration.
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  Point 2: Covers MVC separation of concerns, routing pipelines, and database abstraction.
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  Point 3: Modern ecosystems: Laravel 11/PHP 8.3, React 19, and Node.js LTS runtimes.

Route configuration generally used for remapping URL string. Typically there is a one-to-one relationship between an URL string and its corresponding controller class/method. The segments in a URI normally follow this pattern:

example.com/class/function/id/

In some instances, however, you may want to remap this relationship so that a different class/method can be called instead of the one corresponding to the URL.

For example, you have a class for displaying users profile having the class name "user" and function "base_info()" with user id as following:

example.com/user/base_info

Now you want to remap the URL like this:

example.com/profile/id

Setting your own route configuration rules using following steps:

- *Go to your application directory then open routes.php file under config directory( application /config / routes.php ). - At end of file find $route array - Specify your own routeing criteria ($route['profile/:num']='user/base_info'*;)**

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Note : Routes can either be specified using wildcards or Regular Expressions.

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Wildcards

A typical wildcard route might look something like this:

$route['profile/:num']='user/base_info';

In a route, the array key contains the URI to be matched, while the array value contains the destination it should be re-routed to. In the above example, if the literal word "profile" is found in the first segment of the URL, and a number is found in the second segment, the "user" class and the "base_info" method are instead used.

You can match literal values or you can use two wildcard types these are:

- (:num) will match a segment containing only numbers. - (:any) will match a segment containing any character (except for '/', which is the segment delimiter).

There are three reserved routes:

1) $route['default_controller'] = 'welcome';

This route indicates which controller class should be loaded if the URI contains no data. In the above example, the "welcome" class would be loaded.

2) $route['404_override'] = 'errors/page_missing';

This route will tell the Router which controller/method to use if those provided in the URL cannot be matched to a valid route.

3)$route['translate_uri_dashes'] = FALSE;

This is not exactly a route but allows you to automatically route controller and method names that contain dashes. '-' isn't a valid class or method name character, so it requires translation. When you set this option to TRUE, it will replace ALL dashes in the controller and method URI segments.

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