How can I install PHP 5.56 on Amazon Linux 2 CentOS7?

When I run sudo yum install php56 on my centos7 ec2 instance, the actual version installed is 5.4.

Installing:
php                x86_64      5.4.16-46.amzn2.0.2       amzn2-core      1.4 M
php-cli            x86_64      5.4.16-46.amzn2.0.2       amzn2-core      2.8 M

I canceled that and tried an archive sudo yum install --enablerepo=ius-archive php56u and got an dependency error:

--> Finished Dependency Resolution
Error: Package: php56u-common-5.6.40-1.ius.el7.x86_64 (ius-archive)
       Requires: php56u-pecl-jsonc(x86-64)
       Available: php56u-pecl-jsonc-1.3.6-2.ius.el7.x86_64 (ius-archive)
           php56u-pecl-jsonc(x86-64) = 1.3.6-2.ius.el7
       .....

How do I resolve that package?

I have considered building php 5.6 from source using steps from this site but it is quite long and complicated and I am not an expert. I would rather figure out how to fix the dependency error above.

Any other ideas on how I can get php 5.5+ (I cannot do php7) on this Amazon Linux 2 machine?