define('MSSQL_HOST', 'xxx.xxx.xxx'); // external MSSQL-DB under Windows Server2012
define('MSSQL_USER', 'xxxxxxxxx');
define('MSSQL_PASS', 'xxxxxxxxxxxx');
$connection = odbc_connect('Driver={/opt/plesk/php/5.6/lib/php/modules/odbc.so};Server='.MSSQL_HOST.';', MSSQL_USER, MSSQL_PASS);
$dbQuery = @odbc_exec($connection, '
USE [TEST]
SELECT TOP *
FROM [Tabelle]
');
while($result = @odbc_fetch_array($dbQuery)) {
echo $result['id']."<br />";
}