OS: RedHat CentOS 5.2
PHP: 5.1.6-20

I'm trying to install php-openssl on our server.

First, I modified php.ini with the line "extension=openssl.so" but, it didn't work and I assume that's because
there is not an openssl.so or php-openssl.so in the extensions directory which php.ini reports as being: extension_dir = "/usr/lib64/php/modules"

I then tried:
/$ yum install php-openssl (which displayed
"Loading "fastestmirror" plugin
Loading mirror speeds from cached hostfile
* base: update.myserver.com
* updates: update.myserver.com
* addons: update.myserver.com
* extras: update.myserver.com
Setting up Install Process
Parsing package install arguments
Requested dep: php-openssl is provided by installed package
Nothing to do"

For what it's worth there is an "openssl" directory (/usr/lib64/openssl/engines/) containing: lib4758cca.so, libaep.so, libatalla.so, libchil.so, libcswift.so, libgmp.so, libnuron.so, libsureware.so, and libubsec.so

I've no clue as to the next step. Any help will be greatly appreciated.