CodeIgniter is installed steps

Step-1 Download the CodeIgniter from the link CodeIgniter 3.1.11 is Current Version

Step-2 Unzip the package. Download zip

Step-3 Upload the CodeIgniter folders and files to your server. Normally the index.php file will be at your root.

Step-4 Open the application/config/config.php file with a text editor and set your base URL. If you intend to use encryption or sessions, set your encryption key.

Step-5 If you intend to use a database, open the application/config/database.php file with a text editor and set your database settings.

You can leave few options to their default values except hostname, username, password, database and DB driver.

hostname ? Specify location of your database here e.g. localhost or IP address
username ? Set username of your database here.
password ? Set password of your database here.
database ? Set name of the database here.
dbdriver ? Set type of database that you are using e.g. MySQL, MySQLi, Postgre SQL, ODBC, and MS SQL.

Example :-

hostname ? 127.0.0.1
username ? root
password ? Adi@xxx
database ? ci_test
dbdriver ? mysqli

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