• Launch AMI Image - Amazon Linux AMI 2018.03.0 (HVM) (Not Amazon Linux 2 AMI (HVM))
• Install Apache 2.0 and PHP 5.6

> sudo su
> yum install httpd24 php56

• List other installed PHP packets

> yum list installed | grep php

php56.x86_64                         5.6.38-1.140.amzn1            @amzn-updates
php56-cli.x86_64                     5.6.38-1.140.amzn1            @amzn-updates
php56-common.x86_64                  5.6.38-1.140.amzn1            @amzn-updates
php56-jsonc.x86_64                   1.3.10-1.20.amzn1             @amzn-main   
php56-mbstring.x86_64                5.6.38-1.140.amzn1            @amzn-updates
php56-process.x86_64                 5.6.38-1.140.amzn1            @amzn-updates
php56-xml.x86_64                     5.6.38-1.140.amzn1            @amzn-updates

• Look for other update and install other updates as needed

>  yum search php56

Loaded plugins: priorities, update-motd, upgrade-helper
===================================== N/S matched: php56 =====================================
php56-pecl-propro-devel.x86_64 : php56-pecl-propro developer files (header)
php56-pecl-raphf-devel.x86_64 : php56-pecl-raphf developer files (header)
php56.x86_64 : PHP scripting language for creating dynamic web sites
php56-bcmath.x86_64 : A module for PHP applications for using the bcmath library
php56-cli.x86_64 : Command-line interface for PHP
php56-common.x86_64 : Common files for PHP
php56-dba.x86_64 : A database abstraction layer module for PHP applications
php56-dbg.x86_64 : The interactive PHP debugger
php56-devel.x86_64 : Files needed for building PHP extensions
php56-embedded.x86_64 : PHP library for embedding in applications
php56-enchant.x86_64 : Enchant spelling extension for PHP applications
php56-fpm.x86_64 : PHP FastCGI Process Manager
php56-gd.x86_64 : A module for PHP applications for using the gd graphics library
php56-gmp.x86_64 : A module for PHP applications for using the GNU MP library
php56-imap.x86_64 : A module for PHP applications that use IMAP
php56-intl.x86_64 : Internationalization extension for PHP applications
php56-jsonc.x86_64 : Support for JSON serialization
php56-jsonc-devel.x86_64 : JSON developer files (header)
php56-ldap.x86_64 : A module for PHP applications that use LDAP
php56-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling
php56-mcrypt.x86_64 : Standard PHP module provides mcrypt library support
php56-mssql.x86_64 : MSSQL database module for PHP
php56-mysqlnd.x86_64 : A module for PHP applications that use MySQL databases
php56-odbc.x86_64 : A module for PHP applications that use ODBC databases
php56-opcache.x86_64 : The Zend OPcache
php56-pdo.x86_64 : A database access abstraction module for PHP applications
php56-pecl-apcu.x86_64 : APC User Cache
php56-pecl-apcu-devel.x86_64 : APCu developer files (header)
php56-pecl-http.x86_64 : Extended HTTP support
php56-pecl-http-devel.x86_64 : Extended HTTP support developer files (header)
php56-pecl-igbinary.x86_64 : Replacement for the standard PHP serializer
php56-pecl-igbinary-devel.x86_64 : Igbinary developer files (header)
php56-pecl-imagick.x86_64 : Provides a wrapper to the ImageMagick library
php56-pecl-memcache.x86_64 : Extension to work with the Memcached caching daemon
php56-pecl-memcached.x86_64 : Extension to work with the Memcached caching daemon
php56-pecl-oauth.x86_64 : PHP OAuth consumer extension
php56-pecl-propro.x86_64 : Property proxy
php56-pecl-raphf.x86_64 : Resource and persistent handles factory
php56-pecl-redis.x86_64 : Extension for communicating with the Redis key-value store
php56-pecl-ssh2.x86_64 : Bindings for the libssh2 library
php56-pecl-xdebug.x86_64 : PECL package for debugging PHP scripts
php56-pgsql.x86_64 : A PostgreSQL database module for PHP
php56-process.x86_64 : Modules for PHP script using system process interfaces
php56-pspell.x86_64 : A module for PHP applications for using pspell interfaces
php56-recode.x86_64 : A module for PHP applications for using the recode library
php56-snmp.x86_64 : A module for PHP applications that query SNMP-managed devices
php56-soap.x86_64 : A module for PHP applications that use the SOAP protocol
php56-tidy.x86_64 : Standard PHP module provides tidy library support
php56-xml.x86_64 : A module for PHP applications which use XML
php56-xmlrpc.x86_64 : A module for PHP applications which use the XML-RPC protocol
uuid-php56.x86_64 : Universally Unique Identifier library

  Name and summary matches only, use "search all" for everything.