How to install Apache w/ PHP when "yum install httpd php" fails?

[Kelly Jones]

I did "yum install httpd php" to install Apache w/ PHP, and created a
test page with "<?php phpinfo(); ?>". When I visit it and view source,
I get back "<?php phpinfo(); ?>" instead of my PHP config.

/etc/httpd/conf/httpd.conf says nothing about PHP, so I suspect I did
the install wrong.

How do I enable PHP support in Apache?

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