Server Requirements

PHP and Required Extensions

PHP version 8.1 or newer is required, with the following PHP extensions are enabled:

• intl

• mbstring

• json

Warning

• The end of life date for PHP 7.4 was November 28, 2022.

• The end of life date for PHP 8.0 was November 26, 2023.

• If you are still using PHP 7.4 or 8.0, you should upgrade immediately.

• The end of life date for PHP 8.1 will be December 31, 2025.

Optional PHP Extensions

The following PHP extensions should be enabled on your server:

• mysqlnd (if you use MySQL)

• curl (if you use CURLRequest)

• imagick (if you use Image class ImageMagickHandler)

• gd (if you use Image class GDHandler)

• simplexml (if you format XML)

The following PHP extensions are required when you use a Cache server:

• memcache (if you use Cache class MemcachedHandler with Memcache)

• memcached (if you use Cache class MemcachedHandler with Memcached)

• redis (if you use Cache class RedisHandler)

The following PHP extensions are required when you use PHPUnit:

• dom (if you use TestResponse class)

• libxml (if you use TestResponse class)

• xdebug (if you use CIUnitTestCase::assertHeaderEmitted())

Supported Databases

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

• MySQL via the MySQLi driver (version 5.1 and above only)

• PostgreSQL via the Postgre driver (version 7.4 and above only)

• SQLite3 via the SQLite3 driver

• Microsoft SQL Server via the SQLSRV driver (version 2012 and above only)

• Oracle Database via the OCI8 driver (version 12.1 and above only)

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 pdo drivers

• PostgreSQL via the pdo driver

• MSSQL via the pdo driver

• 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)