参考URL https://docs.moodle.org/29/en/Installing_MSSQL_for_PHP#Using_FreeTDS_on_Debian_Lenny
第一步，下载相应的dll
| PHP version | Thread Safe | FreeTDS version | Download URL |
|---|---|---|---|
| PHP 5.2.x (vc6) | Yes | 0.82 + 20090302 patches | Download! |
| No | 0.82 + 20090302 patches | Download! | |
| PHP 5.3.x (vc6) | Yes | 0.82 + 20090904 patches (unconfirmed) | Download! |
| No | 0.82 + 20090904 patches (unconfirmed) | Download! | |
| PHP 5.3.x (vc9) | Yes | 0.82 + 20090904 patches | Download! |
| No | 0.82 + 20090904 patches | Download! |
第二步，在php.ini中增加extension=php_dblib.dll
第三步，重启IIS
示例代码，测试一下连接是否正常
<?php $link = mssql_connect(‘localhost‘, ‘db_user‘, ‘db_password‘); if(!$link) { echo‘Could not connect‘; die(‘Could not connect: ‘ . mssql_error()); } echo‘Successful connection‘; mssql_close($link); ?>
原文：http://www.cnblogs.com/mssql8/p/4595311.html