linux下使用php接连sql server 2005
首先，mssql extension is not available anymore on Windows with PHP 5.3 or later.
当然，php为我们提供了替代方案：windows下你可以使用微软提供的sqlsrv扩展（官网），而在Linux下则可以使用freetds扩展（官网）。
安装sqlsrv很简单，略过，今天讲讲freetds的安装：
1.下载freetds，解压，进入源文件目录执行：
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./configure --prefix=/usr/local/freetds --with-tdsver=7.2
make
make install
重要提示一：这一步需要注意的是--with-tdsver，sql server2005对应的tds version是7.2(貌似网上能查到的都写8.0)
2.重新编译php
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./configure --prefix=/usr/local/php --with-mssql=/usr/local/freetds/
make
make install
重要提示二：至于configure的其它配置我想你懂的，这里只列出mssql的编译选项。
3.配置/usr/local/freetds/etc/freetds.conf(如果没有egServer72节点则创建，如有则修改)
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# A typical Microsoft server
[egServer72]
host = sql server 2005服务器名
port = 1433
tds version = 7.2
至此，所有准备工作都完成了，下面就可以重启apache，用php调用sql server 2005啦！
重要提示三：在调用mssql_connect函数时，需要注意的是，其第一个参数应该是egServer72（即在freetds.conf里的配置），而不是sql server的IP！！！切记！！！
作者 xiaodao1986
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