PHP 8.4 requires CodeIgniter 4.6.0 or later.

References:

• https://wiki.php.net/todo/php84
• https://wiki.php.net/rfc/deprecations_php_8_4
• https://php.watch/versions/8.4
• Dev: PHP 8.3 support #7850

TODO:

• update docs
  • [4.6] docs: add note about PHP versions supported by CI4 versions #9138
• add PHP 8.4 to GitHub Action PHPUnit testing
  • [4.6] chore: add PHP 8.4 to test-phpunit.yml #9137
  • chore: add PHP 8.4 to test-phpunit.yml #9133
• session.sid_length INI setting is deprecated
  • https://wiki.php.net/rfc/deprecations_php_8_4#sessionsid_length_and_sessionsid_bits_per_character
  • [4.6] feat: force PHP default 32 chars length at 4 bits to Session ID #9139
  • feat: add deprecation error handling for session.sid_length and session.sid_bits_per_character for PHP 8.4 #9135
• Implicitly nullable parameter declarations deprecated
  • https://php.watch/versions/8.4/implicitly-marking-parameter-type-nullable-deprecated
  • [4.6] feat: workaround for implicit nullable deprecations in PHP 8.4 #9140
• DateTime(Immutable)::createFromTimestamp() comaptibility
  • https://php.watch/versions/8.4/datetime-createFromTimestamp
  • [4.6] fix: Time::createFromTimestamp() change for PHP 8.4 #9105
  • fix: TimeTrait::createFromTimestamp() method signature for PHP 8.4 #9134
• CURL_HTTP_VERSION_3
  • https://php.watch/articles/php-curl-http3
  • feat: support CURL HTTP3 #9145
• Dependent packages (feat: full support on PHP8.4 #9255)
  • Psalm (Add support for PHP 8.4 vimeo/psalm#10928)
  • PHP-CS-Fixer (feat: PHP 8.4 compatibility support PHP-CS-Fixer/PHP-CS-Fixer#8300)
  • Faker (PHP 8.4 Support FakerPHP/Faker#904)
  • vfsStream (Fix PHP 8.4 deprecate-implicitly-nullable-types bovigo/vfsStream#290)
  • Kint (chore: update Kint to v6.0 #9289)
  • Predis (explicitly mark nullable parameters as nullable predis/predis#1448)
• Update highest versions to 8.4 in GitHub Action flows
• Update Issue Template
  • See chore: add PHP 8.4 to issue template #9353
• remove --ignore-platform-req=php in composer.json "post-autoload-dump"
  • See [4.6] chore: add PHP 8.4 to test-phpunit.yml #9137