• PHP Versions for Horde 6

Horde 6 requires PHP 8.1 or PHP 8.2 versions.
Support for PHP 8.3 is in development.

++ Ubuntu and Debian
Install following packages:
apt-get install composer
apt-get install php-xml
apt-get install php-curl
apt-get install php-ldap
apt-get install php-bcmath
apt-get install php-mysql

++ PHP Extensions

• PHAR extension is required for composer and other utilities
• gettext for localisation
• intl
• iconv
• PDO and SQL Database extensions
• curl for API requests

Depending on installed Horde applications and used backends, other extensions are required.
For a fairly complete reference, the groupware container image currently uses these PHP extensions:

• php8-APCu
• php8-bcmath
• php8-bz2
• php8-ctype
• php8-calendar
• php8-curl
• php8-dom
• php8-gd
• php8-gettext
• php8-iconv
• php8-imagick
• php8-intl
• php8-ldap
• php8-mbstring
• php8-mysql
• php8-opcache
• php8-openssl
• php8-pcntl
• php8-pdo
• php8-phar
• php8-posix
• php8-redis
• php8-soap
• php8-sockets
• php8-sqlite
• php8-tokenizer
• php8-xmlwriter
• php8-xmlreader
• php8-zip
• php8-zlib

Composer will tell user whenever a platform requirement is missing.