CodeIgniter is one of the most popular
PHP frameworks around. It uses the Model-View-Controller Architectural design pattern and it’s considered by lots of
developers as one of the best framework solution for small to medium projects.
First of all, you need to download. https://ellislab.com/codeigniter/user-guide/installation/downloads.html.
Configuring CodeIgniter
Now you have CodeIgniter installed on your server for the configuration. Open the application/config/config.php
file and set your base URL. If you intend to
use encryption or sessions, set your encryption key. For the database
configuration, open the application/config/database.php and update with your details.
The following is a quick description of what you can do by editing some of the most commonly used configuration files:
- autoload.php:
specifies which systems (Packages, Libraries, Helper files, Custom
config files, Language files and Models) should be loaded by default.
- config.php: contains all website configuration.
- constants.php: contains defined constants which are used when checking and setting modes when working with the file system.
- database.php: contains the settings needed to access your database.
- email.php: This file
is not created by default. But you can create it and set the default
values for the email class. Like: mailtype, charset, newline, protocol,
smtp_host, etc.
- hooks.php: lets you define “hooks” to extend CI without editing the core files.
- mime.php: contains an array of mime types. It is used by the upload class to help identify allowed file type.
- routes.php: lets you re-map URI requests to specific controller functions.
- smileys.php: contains an array of smileys for use with the emoticon helper.
- upload.php: This file
is not created by default. But you can create it and set the default
values for the upload class. Like: upload_path, allowed_types, max_size,
max_width, max_height, etc.
- user_agents.php:
contains four arrays of user agent data. It is used by the User Agent
Class to help identify browser, platform, robot, and mobile device data.
The array keys are used to identify the device and the array values are
used to set the actual name of the item.
I search an API for send a message in whatsapp through in website in php. it’s relatively easy to send and receive WhatsApp messages via PHP. Using the PHP-based framework WhatsAPI, a simple WhatsApp notifier script only has a dozen lines of code. 
