I'm currently facing an issue with registering the php74Extensions.redis in my NixOS environment, and I'm seeking some guidance to resolve it.
I'm able to get xdebug to correctly register with the zend_extension = "${php.php74Extensions.xdebug}/lib/php/extensions/xdebug.so" and I've can see the redis.so exists in the nixstore path /nix/store/hnjkll3gvx7nm8i7vm1mc1cpa4b1p3lh-php-redis-5.3.4/lib/php/extensions/ for the php74Extensions.redis package. However phpinfo fails to register the redis package (xdebug is showing as expected and changed to the config or removing the xdebug.so entry reflect the phpinfo.)

Here's a brief overview of my configuration:

configuration.nix:

{ config, pkgs, lib, ... }:
let
  php = import
    (builtins.fetchTarball {
      url = "https://github.com/NixOS/nixpkgs/archive/2766f77c32e171a04d59b636a91083bae862274e.tar.gz"; #7.4.29 php
    })
    { };
in
{
  imports =
    [
      # Include the results of the hardware scan.
      ./hardware-configuration.nix
      (import /home/stotes/nix/server/nginx-php.nix { inherit config php lib pkgs; })
    ];
    # ... continues
}

nginx-php.nix:

{ config, pkgs, lib, php, ... }:
{
  environment.systemPackages = with php; [
    php.php74
    php.phpPackages.composer
    php.php74Extensions.pdo
    php.php74Extensions.redis
    php.php74Extensions.xdebug
  ];

  services.phpfpm.phpOptions = ''
    date.timezone = Australia/Brisbane
    extension = "${php.php74Extensions.redis}/lib/php/extensions/redis.so"
    zend_extension = "${php.php74Extensions.xdebug}/lib/php/extensions/xdebug.so"
  '';
}

nix-created php.ini entries:

date.timezone = Australia/Brisbane
extension = "/nix/store/hnjkll3gvx7nm8i7vm1mc1cpa4b1p3lh-php-redis-5.3.4/lib/php/extensions/redis.so"
zend_extension = "/nix/store/hsprflbbk5a0hqaysm7vaspqmn2l1nyg-php-xdebug-3.0.4/lib/php/extensions/xdebug.so"

Despite my configuration, the php74Extensions.redis package is not registering as expected. I've followed the NixOS documentation and community forums but couldn't find a solution. Can someone please guide me on what might be causing this issue or any steps I can take to troubleshoot it further?

Any help or insights would be greatly appreciated. Thank you in advance for your assistance!

This is my (working) config. Unless something changed in between versions, you can adapt it to php74:

environment.systemPackages = with pkgs; let
   php82 = pkgs.php82.buildEnv {
     extensions = ({ enabled, all }: enabled ++ (with all; [
       xdebug
       redis
       xsl
       ffi
     ]));
     extraConfig = ''
       memory_limit=8G
       xdebug.mode=debug
     '';
  };
    in
  [
    php82
    php82.packages.composer
    php82Extensions.redis
    php82Extensions.xsl
  ];

In reply to @drupol:matrix.org
Do you have any issue in the log while loading PHP (including the redis extensions) ?

/nix/store/hnjkll3gvx7nm8i7vm1mc1cpa4b1p3lh-php-redis-5.3.4/lib/php/extensions/redis.so: undefined symbol: php_session_create_id)

In reply to @rikudou:lemmings.world

This is my (working) config. Unless something changed in between versions, you can adapt it to php74:

environment.systemPackages = with pkgs; let
   php82 = pkgs.php82.buildEnv {
     extensions = ({ enabled, all }: enabled ++ (with all; [
       xdebug
       redis
       xsl
       ffi
     ]));
     extraConfig = ''
       memory_limit=8G
       xdebug.mode=debug
     '';
  };
    in
  [
    php82
    php82.packages.composer
    php82Extensions.redis
    php82Extensions.xsl
  ];

In reply to @rikudou:lemmings.world
Adam Stotesbury: Have you tried using my config?

Here's a fully working shell.nix with what you want, it can easily be adapted:

{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
    nativeBuildInputs = with pkgs.buildPackages;
    let
      custom = import (builtins.fetchTarball https://github.com/nixos/nixpkgs/tarball/0e4ade244d0f1b01a378aa58c235a1576778c1fd) {};
      php74 = pkgs.php.buildEnv {
        extensions = ({ enabled, all }: enabled ++ (with all; [
          redis
          xdebug
        ]));
        extraConfig = ''
          xdebug.mode=debug
          date.timezone=Australia/Brisbane
        '';
      };
    in
    [
      php74
      custom.phpPackages.composer
      custom.php74Extensions.pdo
      custom.php74Extensions.redis
      custom.php74Extensions.xdebug
    ];
}

Here's a fully working shell.nix with what you want, it can easily be adapted to configuration.nix:

{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
    nativeBuildInputs = with pkgs.buildPackages;
    let
      custom = import (builtins.fetchTarball https://github.com/nixos/nixpkgs/tarball/0e4ade244d0f1b01a378aa58c235a1576778c1fd) {};
      php74 = pkgs.php.buildEnv {
        extensions = ({ enabled, all }: enabled ++ (with all; [
          redis
          xdebug
        ]));
        extraConfig = ''
          xdebug.mode=debug
          date.timezone=Australia/Brisbane
        '';
      };
    in
    [
      php74
      custom.phpPackages.composer
      custom.php74Extensions.pdo
      custom.php74Extensions.redis
      custom.php74Extensions.xdebug
    ];
}

Here's a fully working shell.nix with what you want, it can easily be adapted to configuration.nix:

{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
    nativeBuildInputs = with pkgs.buildPackages;
    let
      custom = import (builtins.fetchTarball https://github.com/nixos/nixpkgs/tarball/1d8b8365a02efbf668311dc9db06cb98d49e7302) {};
      php74 = pkgs.php74.buildEnv {
        extensions = ({ enabled, all }: enabled ++ (with all; [
          redis
          xdebug
        ]));
        extraConfig = ''
          xdebug.mode=debug
          date.timezone=Australia/Brisbane
        '';
      };
    in
    [
      php74
      custom.phpPackages.composer
      custom.php74Extensions.pdo
      custom.php74Extensions.redis
      custom.php74Extensions.xdebug
    ];
}

Here's a fully working shell.nix with what you want, it can easily be adapted to configuration.nix:

{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
    nativeBuildInputs = with pkgs.buildPackages;
    let
      custom = import (builtins.fetchTarball https://github.com/nixos/nixpkgs/tarball/0e4ade244d0f1b01a378aa58c235a1576778c1fd) {};
      php74 = pkgs.php.buildEnv {
        extensions = ({ enabled, all }: enabled ++ (with all; [
          redis
          xdebug
        ]));
        extraConfig = ''
          xdebug.mode=debug
          date.timezone=Australia/Brisbane
        '';
      };
    in
    [
      php74
      custom.phpPackages.composer
      custom.php74Extensions.pdo
      custom.php74Extensions.redis
      custom.php74Extensions.xdebug
    ];
}

Here's a fully working shell.nix with what you want, it can easily be adapted to configuration.nix:

{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
    nativeBuildInputs = with pkgs.buildPackages;
    let
      custom = import (builtins.fetchTarball https://github.com/nixos/nixpkgs/tarball/1d8b8365a02efbf668311dc9db06cb98d49e7302) {};
      php74 = custom.php74.buildEnv {
        extensions = ({ enabled, all }: enabled ++ (with all; [
          redis
          xdebug
        ]));
        extraConfig = ''
          xdebug.mode=debug
          date.timezone=Australia/Brisbane
        '';
      };
    in
    [
      php74
      custom.php74Packages.composer
      custom.php74Extensions.pdo
      custom.php74Extensions.redis
      custom.php74Extensions.xdebug
    ];
}

In reply to @rikudou:lemmings.world
Also, you might want to use a project of mine for getting older versions, for example: https://history.nix-packages.com/search?packageName=php74

It should have the latest version the package is found in, meaning the newest available dependencies for each version

In reply to @drupol:matrix.org
You should add the template for flake inputs ! :)