PHP pages are not parsed by Apache on CentOS

The code should be correct with just the <?php phpinfo(); ?> so I'm assuming the issue would be with a configuration setting.

Since it looks like you already named the file index.php, I would double check:

1. That the files are in the proper web root directory, and
2. The WAMP configuration is selecting that directory for web root.

However, if those two checks turn out clean and since you're on Windows, I would suggest that you still double check the file extension to ensure that it's a .php and not a text file by right clicking on the file and selecting properties (not by what it says in the file explorer). Depending on the program you are using, it still may default to saving as a .txt file even if you put .php at the end of your file name (Notepad can be bad about this).

Another option, if you're only doing some basic PHP development is MAMP. I've personally found it easier to use than WAMP, but that's just my experience and I'm sure there may be some that disagree with me.

If apache is rendering as text your php file, then apache is not configured to use php.

You need to find your httpd.conf file. Unfortuneately, different installs put this in different locations. Start looking in /etc/httpd directory structure. Other places might be /usr/local/etc/httpd. For the below, I'm going to assume /etc/httpd.

When you find httpd.conf, look for ServerRoot. This may be /etc/httpd. There should be a "modules" directory or symbolic link to a directory.

In this directory should be the php module if it was installed, say libphp5.so. First confirm you have a php module in the "modules" directory.

Next, we need to tell apache to use php.

Apache loads a default config file, httpd.conf, and additional config files typically in "extra" or "conf.d" directories. See if you have any of those, and within those should be a php.conf file.

If there is no php.conf file, that could be your issue. Here's a simple one:

LoadModule php5_module modules/libphp5.so
AddHandler php5-script .php
AddType text/html .php
DirectoryIndex index.php

What this does is tell apache to load the libphp5.so module, associate the .php extension to it, expect the output of the php script to be html, and if an index.php file exists use it when a user goes to a directory instead of specific url.