If PHP was installed, you have a php.ini file. In my 12 years of using it, I've never had an installation with out it.
If you don't think the changes and configuration (httpd.conf pointing to your newly created ini file) is working, run phpinfo() function in a blank php file, and it will tell you the location of the php.ini file that PHP is actually using.
Once you locate the file its using, you may want to back out your other changes and edit this other file.
This should at least let you troubleshoot which php.ini is being used.
Were you able to use mysql before? Perhaps PDO requires the standard MySQL extenstion to be present in order to work? I don't use PDO, so I can't comment on that part.
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