Server Requirements

PHP version 7.2 or newer is required, with the *intl* extension and *mbstring* extension installed.

The following PHP extensions should be enabled on your server: php-json, php-mysqlnd, php-xml

In order to use the CURLRequest, you will need libcurl installed.

A database is required for most web application programming. Currently supported databases are:

Not all of the drivers have been converted/rewritten for CodeIgniter4. The list below shows the outstanding ones.

MySQL (5.1+) via the pdo driver
Oracle via the oci8 and pdo drivers
PostgreSQL via the pdo driver
MS SQL via the mssql, sqlsrv (version 2005 and above only) and pdo drivers
SQLite via the sqlite (version 2) and pdo drivers
CUBRID via the cubrid and pdo drivers
Interbase/Firebird via the ibase and pdo drivers
ODBC via the odbc and pdo drivers (you should know that ODBC is actually an abstraction layer)