Forum Moderators: coopster
Read the installation notes: [php.net...]
A file named libmysql.dll is included in the Windows PHP distribution and in order for PHP to talk to MySQL this file needs to be available to the Windows systems PATH.
Follow the link provided by eelixduppy and read up on the Windows Installation, it is all right there. If you are using a distro package you may have to read their specific documentation.