Key Features of CodeIgniter 4:

• CI is an MVC framework with a small footprint.
• You want extraordinary performance.
• It require a framework that nearly requires zero configurations.
• User need a framework that doesn’t require you to use the command line.
• You need a framework that doesn’t require you to stick to restrictive coding rules.
• User aren’t interested by large-scale monolithic libraries like PEAR.
• You do not need to be compelled to study a templating language (although a template parser is alternatively accessible if you desire one).
• It eschew complexity, preferring straightforward solutions.
• User want clear, exhaustive documentation.

Features of CodeIgniter 4:

1. The previous variations of Codeigniter are primarily based on PHP 5.6 or lower but the Codeigniter 4 could be featured with PHP 7.2 capability and compatibility.
2. It required the *intl* extension of PHP established on the server.
3. If we would really like to apply CURLRequest, we will need lib curl installed.
4. Supported databases are:
   1. MySQL (5.1+) through the MySQLi driver
   2. PostgreSQL through the Postgre driver
   3. SqLite3 through the SQLite3 driver
5. CodeIgniter 4 also can be used with command-line programs. As in line with the ultra-modern trend, maximum of the frameworks provide CLI usability and library. Since Codeigniter 4 the framework will also be imparting CLI interfaces for distinct purposes.
6. The following PHP extensions ought to be enabled to your server:
   1. Php-json
   2. Php-mbstring
   3. Php-mysqlnd
   4. Php-xml
7. If you want to apply CURLRequest in your Codeigniter application, you will need to install libcurl.
8. The framework currently support for a public folder, meant as the document root on your application.
9. Hooks in Codeigniter are a superb characteristic in is kept and upgrade as well.