PHP breaks Apache on CentOS 6.5

I have finished configuring a fresh Joomla installation on a CentOS 6.5 server.
I then proceeded to upgrade Joomla to the latest version from the admin panel.
The upgrade produced an error about not being able to copy robots.txt.dist and stopped.
As I could no longer access the web admin interface I proceeded with restarting the httpd service.
After I had done this, upon trying to access Joomla I got a blank page.
I then deleted all the Joomla files and made a fresh copy from the downloaded archive from the Joomla webpage, but upon trying to access the web configuration I got a blank page again.
I then removed Joomla completely and reinstalled php and php-mysql with yum.
That didn't help so i removed both php packages completely.
After doing that I got the default apache webpage loading again.
I then installed php and php-mysql again, after which I immediately get a blank page when trying to access the homepage or a test script index.php.

How could I remove all traces of php config and do a fresh install or should I do something else?
proteus-IVAsked:
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YoavZCommented:
More information is needed, mostly log files.

Please attach a copy of Apache access logs / error logs - most probably located at /var/lib/httpd

Provide us with the output of `httpd -M`.

If re-installing the server is a quick possibility (in case of cloud server) I suggest installing the server and running the following:

yum -y update
yum install httpd mysql mysql-server php php-mysql
chkconfig httpd on
chkconfig mysqld on
/usr/bin/mysql_secure_installation
service httpd restart
service mysqld restart

The following commands will get you up and running in 5 minutes of setup on a clean CentOS 6 installation.

Although I know that common CMS systems have RPM packages available, I strongly suggest against using them.
Installing Wordpress is as easy as:
cd /var/www/html
wget http://wordpress.org/latest.tar.gz
tar xzvf latest.tar.gz

And you are done!
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proteus-IVAuthor Commented:
I checked the apache error_log and found out that it is mentioning "open_basedir" and stating that it cannot access it.
I then proceeded to edit php.ini and I commented out "open_basedir = /tmp".
After that I restarted httpd and php scripts started displaying in the browser.

Thanks for your help.
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