I searched online for how to connect PHP 5.3. Driver package,
Method http://pecl.php.net/package/PDO_DBLIB
Solution to using php_dblib.dll of php_mssql in php5.3,
1. Save it to ext in the PHP directory. This extension requires the same .NET Framework 1.1 file permissions as php5ts.dll in the PHP directory. 2. Add extension=php_dblib.dll to the Windows Extensions section of php.ini.
Then download the FreeTDS plug-in 5.3 to access the SQL Server database
php5.2
Thread Safe
http://download.moodle.org/download.php/dblib/php52/DBLIB_TS.zip
NOT Thread Safe
http://download.moodle.org/download.php/dblib/php52/DBLIB_NOTS.zip
php5.3
Thread Safe
http://download.moodle.org/download.php/dblib/php53/DBLIB_TS.zip
NOT Thread Safe
http://download.moodle.org/download.php/dblib/php53/DBLIB_NOTS.zip