Cannot send email from PHP using gmail SMTP

I tried to send messages from wordpress using gmail SMTP.

Server is set to smtp.gmail.com and port to 465.

I'm getting this message:

SMTP -> ERROR: Failed to connect to server: Unable to find the

socket transport "ssl" - did you forget to enable it when you configured PHP? (34225384)

I'm on centOS

Should I recompile PHP and just enable something somewhere ?

It sounds like openssl hasn't been installed/enabled. Check phpinfo() for mentions of openssl, if it's not there you might need to re-compile with openssl support or enable the extension in php.ini.

Did you remove the ; in front of the line extension=php_openssl.dll in your php.ini?