Server Requirements

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

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

• MySQL (5.1+) via the MySQLi driver
• PostgreSQL via the Postgre driver
• SQLite3 via the SQLite3 driver

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)