John Davidson

Message:

I am trying to install ZeroMQ extension for PHP using Docker image php:7.4-apache-buster.

The package is found when running apt list:

$ sudo apt update && apt list php-zmq outputs php-zmq/stable 1.1.3-9 amd64

It is not possible to install it however:

$ sudo apt install php-zmq outputs E: Package 'php-zmq' has no installation candidate

I have checked that the package is not already installed using apt list --installed php-zmq. Underlying libzmq5 library is present on the system.

I wonder how does apt list command work that it suggests packages which apt install is unable to install.

Thanks for any help.

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My Answer:
"PHP (Hypertext Preprocessor) is a popular server-side scripting language used for web development. APT (Advanced Package Tool) is a package management system used in Debian-based Linux distributions to install, update, and remove software packages. It is used to manage PHP packages and dependencies on a Linux system."