Newb question: Running CentOS 5.x I had an older version of PHP (about 5.2.9 or something) and I downloaded the source for and installed the latest (5.2.17). Now, I checked yum and it had PHP 5.2.17 so I installed it. So now I have php installed by yum in /usr/bin and my old manual install in /usr/local/bin. I'm getting an exception 'pdo_mysql extension not installed' when I try to run php from the command line for some users and I think that the problem is that I have two PHPs running around. How can I get rid of the manually installed one?