PHP on centos 6 not working

If your SELinux config is ok, it seems that this error occured because server configuration.

If you have installed php, then make sure that it is loaded by apache and apache is associated with php handler.

LoadModule php5_module        modules/libphp5.so
AddType application/x-httpd-php .php

And you should check your .htaccess. It may have some configurations that overrided apache's config.

yum install mod_php -y
systemctl restart httpd.service