Server Requirements

PHP and Required Extensions

PHP version 7.4 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. If you are still using PHP 7.4, you should upgrade immediately. The end of life date for PHP 8.0 will be November 26, 2023.

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 2005 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)