Apache httpd cannot parse php on CentOS 7

I'm setting up a new CentOS 7 server,

I installed apache httpd successfully and get the html welcome page then I installed php 5.4 then tried to test it using test page:

<?php
phpinfo();
?>

placed it in /var/www/html but I got a blank page. apache error log says:

[Mon Jan 26 21:20:12.474636 2015] [:error] [pid 8352] [client ::1:60206] PHP Fatal error:  Unknown: Failed opening required '/var/www/html/test.php' (include_path='.:/php/includes') in Unknown on line 0

What I tried is:

in /etc/httpd/conf/httpd.conf I added:

LoadModule php5_module "/usr/lib64/php"
AddType application/x-httpd-php  .php

and found: DirectoryIndex index.html then add index.php

I also uncommitted include_path='.:/php/includes' in /etc/php.ini

then restart apache. Nothing changed! Any idea?

UPDATE

When I checked: apachectl configtest I got:

[Mon Jan 26 22:22:49.748764 2015] [so:warn] [pid 4984] AH01574: module php5_module is already loaded, skipping
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain. Set the 'ServerName' directive globally to suppress this message
Syntax OK

So I listed my hosts:

[admin@localhost etc]$ cat hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

then replaced ServerName www.example.com:80 in httpd.conf with ServerName localhost4.localdomain4 and also tried ServerName localhost:80

but still the issue exists. However the apachectl configtest result became:

[Mon Jan 26 22:49:46.968433 2015] [so:warn] [pid 5841] AH01574: module php5_module is already loaded, skipping
Syntax OK

and error_log:

[Mon Jan 26 22:58:27.110725 2015] [:error] [pid 6103] [client ::1:47747] PHP Fatal error:  Unknown: Failed opening required '/var/www/html/test.php' (include_path='.:/php/includes') in Unknown on line 0

SOLUTION

I finally decided to uninstall php54 then re install php with the following command:

yum install php php-pear

then changed ServerName in conf to localhost:80 and it works!

Thanks all for your time