How do I install a package (php 7.4 or 7.3 or 7.2) from the Extras Library on an EC2 instance running Amazon Linux 2 

1.    Connect to your EC2 Linux instance using SSH.

2.    Use the which command to confirm that the amazon-linux-extras package is installed:

# which amazon-linux-extras
/usr/bin/amazon-linux-extras

If the amazon-linux-extras package isn't installed, use yum to install it:

# yum install -y amazon-linux-extras

3.    List the available topics.

Myserver #amazon-linux-extras  0  ansible2                 available    \
        [ =2.4.2  =2.4.6  =2.8  =stable ]
  2  httpd_modules            available    [ =1.0  =stable ]
  3  memcached1.5             available    \
        [ =1.5.1  =1.5.16  =1.5.17 ]
  5  postgresql9.6            available    \
        [ =9.6.6  =9.6.8  =stable ]
  6  postgresql10             available    [ =10  =stable ]
  9  R3.4                     available    [ =3.4.3  =stable ]
 10  rust1                    available    \
        [ =1.22.1  =1.26.0  =1.26.1  =1.27.2  =1.31.0  =1.38.0
          =stable ]
 11  vim                      available    [ =8.0  =stable ]
 18  libreoffice              available    \
        [ =5.0.6.2_15  =5.3.6.1  =stable ]
 19  gimp                     available    [ =2.8.22 ]
 20  docker=latest            enabled      \
        [ =17.12.1  =18.03.1  =18.06.1  =18.09.9  =stable ]
 21  mate-desktop1.x          available    \
        [ =1.19.0  =1.20.0  =stable ]
 22  GraphicsMagick1.3        available    \
        [ =1.3.29  =1.3.32  =1.3.34  =stable ]
 23  tomcat8.5                available    \
        [ =8.5.31  =8.5.32  =8.5.38  =8.5.40  =8.5.42  =8.5.50
          =stable ]
 24  epel                     available    [ =7.11  =stable ]
 25  testing                  available    [ =1.0  =stable ]
 26  ecs                      available    [ =stable ]
 27  corretto8                available    \
        [ =1.8.0_192  =1.8.0_202  =1.8.0_212  =1.8.0_222  =1.8.0_232
          =1.8.0_242  =stable ]
 28  firecracker              available    [ =0.11  =stable ]
 29  golang1.11               available    \
        [ =1.11.3  =1.11.11  =1.11.13  =stable ]
 30  squid4                   available    [ =4  =stable ]
 32  lustre2.10               available    \
        [ =2.10.5  =2.10.8  =stable ]
 33  java-openjdk11           available    [ =11  =stable ]
 34  lynis                    available    [ =stable ]
 35  kernel-ng                available    [ =stable ]
 36  BCC                      available    [ =0.x  =stable ]
 37  mono                     available    [ =5.x  =stable ]
 38  nginx1                   available    [ =stable ]
 39  ruby2.6                  available    [ =2.6  =stable ]
 40  mock                     available    [ =stable ]
 41  postgresql11             available    [ =11  =stable ]
 42  php7.4=latest            enabled      [ =stable ]
 43  livepatch                available    [ =stable ]
 44  python3.8                available    [ =stable ]
 45  haproxy2                 available    [ =stable ]
 46  collectd                 available    [ =stable ]
 47  aws-nitro-enclaves-cli   available    [ =stable ]
 48  R4                       available    [ =stable ]
 49  kernel-5.4               available    [ =stable ]
 50  selinux-ng               available    [ =stable ]
  _  php8.0                   available    [ =stable ]
 52  tomcat9                  available    [ =stable ]
 53  unbound1.13              available    [ =stable ]
 54  mariadb10.5              available    [ =stable ]
 55  kernel-5.10              available    [ =stable ]
 56  redis6                   available    [ =stable ]
 57  ruby3.0                  available    [ =stable ]
 58  postgresql12             available    [ =stable ]
 59  postgresql13             available    [ =stable ]
 60  mock2                    available    [ =stable ]
 61  dnsmasq2.85              available    [ =stable ]
Myserver #

4.    Enable the desired topic. The output shows the commands required for installation. For example, to enable the PHP 7.4 topic, use the following command:

# amazon-linux-extras enable php7.4

5.    Install the topic using yum. For example, to install the PHP 7.2 topic, use the following command:

# yum clean metadata && sudo yum install php-cli php-pdo php-fpm php-json php-mysqlnd

6.    Use the following commands to verify the installation and confirm the software version:

Myserver #yum list installed php-cli php-pdo php-fpm php-json php-mysqlnd
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
Installed Packages
php-cli.x86_64                                                                  7.4.28-1.amzn2                                                               @amzn2extra-php7.4
php-fpm.x86_64                                                                  7.4.28-1.amzn2                                                               @amzn2extra-php7.4
php-json.x86_64                                                                 7.4.28-1.amzn2                                                               @amzn2extra-php7.4
php-mysqlnd.x86_64                                                              7.4.28-1.amzn2                                                               @amzn2extra-php7.4
php-pdo.x86_64                                                                  7.4.28-1.amzn2                                                               @amzn2extra-php7.4
Myserver #
$ which php
/usr/bin/php        

Myserver #php --version
PHP 7.4.28 (cli) (built: Feb 28 2022 23:38:08) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
Myserver #