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CodeIgniter – organizing controllers into sub-folders a wild card _remap function

For a "hello world" project it is really not important, but building a CMS using the most amazing framework requires an organized "controllers" set. Implementing sub-folder for organizing controllers is probably the most efficient way to do this.

Here is an example...

I am writing a new "users" controller. The controller has following methods

So, instead of writing all these methods in the "users.php" controller file, I am going to create a "users" folder and create corresponding php files those methods. So my "users" folder directory tree going to look something like this

My controllers usually have "index" method, which is the default method for the controller. The URL '' will reach the 'index' method. By default that is how the most amazing framework works. But, the URL '' will cause a 404 error! If we have a method called "view", '' is going to work, but for some reason, we may absolutely need the URL to be ''.

This is doable via the awesome "_remap" function!

For 'wild card' function matching,

function _remap($method) {
 if(method_exists ($this, $method)) {
  } else {


Codeigniter form validation “French” messages

Here are all the CodeIgniter form validation messages in French. Well I do not speak the language so I turned to the language expert! I am not sure about the grammar, so info for a better solution would be appreciated.

$lang['required'] = "Le champ %s est nècessaire.";
$lang['isset'] = "Le champ %s doit avoir une valeur.";
$lang['valid_email'] = "Le champ %s doit contenir une adresse email valide.";
$lang['valid_emails'] = "Le champ %s doit contenir toutes les adresses e-mail valide.";
$lang['valid_url'] = "Le champ %s doit contenir une URL valide.";
$lang['valid_ip'] = "Le champ %s doit contenir une adresse IP valide.";
$lang['min_length'] = "Le champ %s doit Ítre au moins %s caractères de longueur.";
$lang['max_length'] = "Le champ %s ne peut pas dÈpasser %s caractères.";
$lang['exact_length'] = "Le champ %s doit Ítre exactement de %s caractères.";
$lang['alpha'] = "Le champ %s ne peut contenir que des caractères alphabÈtiques.";
$lang['alpha_numeric'] = "Le champ %s ne peut contenir que des caractères alpha-numÈriques.";
$lang['alpha_dash'] = "Le champ %s ne peut contenir que des caractères alphanumÈriques, tirets et les tirets.";
$lang['numeric'] = "Le champ %s doit contenir uniquement des nombres.";
$lang['is_numeric'] = "Le champ %s ne doit contenir que des caractères numÈriques.";
$lang['integer'] = "Le champ %s doit contenir un nombre entier.";
$lang['matches'] = "Le champ %s ne correspond pas au champ %s.";
$lang['is_natural'] = "Le champ %s ne doit contenir que des nombres positifs.";
$lang['is_natural_no_zero'] = "Le champ %s doit contenir un nombre supÈrieur ‡ zÈro.";



After Facebook user "allows" the application, Facebook redirects users to the application canvas (or the calling controller) URL with Facebook generated authentication code.

For example, controller "invite", requires (Facebook) user authentication. The controller probably going to have something like this

$CI->load->library('Facebook'); // Facebook API library
$CI->facebook = new Facebook($this->fb_api_key, $this->fb_secret);//initialize facebook class
$this->fb_client = $CI->facebook->api_client;
$this->fb_user_id = $CI->facebook->require_login(); // get the FB user id

After the "require_login" call, Facebook will ask for the user to provide permission, and if the user allows the app to access user's personal data, facebook will redirect the user to{%22session_key%22:%222.besQb6tf33wpIJ7hQTnx_Q__.3600.1278370800-

By default, CodeIgniter would throw a 404 cause it is designed to work only with segmented URI. But it is absolutely impossible to build a Facebook application with such setup. Well, saying absolutely impossible is quite the thing,in fact it is. Application with regular setup may work but chances are, would break very frequently as Facebook keeps sending session variable(I saw entire file binary data once) over GET.

So we need to customize CodeIgniter to make sure the (most amazing) framework can accept such mixed input.

Step 1: Open application/config.php file, and search for $config['uri_protocol'] and change the value to "PATH_INFO". So that line would look like
$config['uri_protocol'] = "PATH_INFO";

Step 2: In same application/config.php file, search for $config['enable_query_strings'] and change the value to "TRUE". So that line would look like
$config['enable_query_strings'] = "TRUE";

Step 3: Now, in thesame application/config.php file, search for $config['permitted_uri_chars'] and change the value to a suitable combination.

"a-z 0-9~%.:_\-+?=!,${}"\'[]&" works really great. The session variable is technically a JSON dump from Facebook, so this combination has a few unusual characters.

So now you can access both the segmented URI variables and GET variables via "$this->uri->uri_to_assoc(n)" and "$_GET" respectively.

VERY IMPORTANT: Above mod(I could say "customization" or something else!!!) would make the (most amazing) framework vulnerable to SQL injection and many other unethical injections, so take necessary steps to secure it!


GET URL with Codeigniter

I copied the Codeigniter URI library to my application libraries folder. Keeping the same name ensures CI would read my custom URI library, not the default one.

Add custom functionality(whatever needs to be done to the GET variables) to

function _filter_uri($str)

I am parsing the string and returning CI friendly URI!

function _filter_uri($str)


Building Facebook and Facebook Connect application with Codeigniter – Setup

Developing for Facebook is quite simple and easy if you have the right components.  I used Codeingniter as a base framework for a few Facebook applications and that works pretty well .  I had to do some little tweaking though.

This entry is not about how to build a Facebook application in Codeigniter, its more like the things that I have done to get it going...

I named my controller “fbook”. Very important as the Facebook library is “Facebook” under “application/libraries/”

The “Facebook” PHP client comes with 3 main files,
1. facebook_desktop.php
2. facebookapi_php5_restlib.php
3. facebook.php
We need to create a CI library from these 3 files and the “jsonwrapper”. Create a “facebook-clinet” folder under “application/libraries” folder. Copy paste all the files from the Facebook API library except “facebook.php” to this newly created folder. Rename the “facebook.php” file to “Facebook.php” and place it under “application/libraries” folder. Add the following line to the “Facebook.php” file
include_once 'facebook-client/facebookapi_php5_restlib.php';
This will include the REST library.

This is pretty much the initial setup. You can use the same “Facebook” library to for “Facebook Connect” functionality.