Initially, I was trying to install a PEAR package and kept getting this:
sh-3.2# pear install MDB2_Driver_mssql
pear/MDB2_Driver_mssql requires PHP extension "mssql"
No valid packages found
I tried simply uncommenting: extension=php_mssql.dll in my php.ini file and restarting xampp, but I got the same message. Looking at the control panel output, I see:
PHP Warning: PHP Startup: Unable to load dynamic library '/Applications/xampp/xamppfiles/lib/php/php5/extensions/no-debug-non-zts-20060613/php_mssql.dll' - (null) in Unknown on line 0