PHP连接SQLServer2005数据库步骤详解
环境：IIS6.0 PHP5 SQL Server2005
SQL Server安装的时候选择混合登陆模式，即windows和sql server身份验证模式。
步骤：
1. 首先按通常做法配置好PHP5连接MS SQL Server
PHP.ini 里面打开 extension=php_mssql.dll 选项 （就是把前面的 ； 号去掉）
mssql.secure_connection = Off
2. 下载正确版本的 ntwdblib.dll (2000.80.194.0)
3. 覆盖 c:windowssystem32
twdblib.dll
4. 覆盖 php
twdblib.dll（有时候完成了这一步也不成功的话，就把PHP所依赖的php5ts.dll放到system32目录下）
5. 运行 SQL Server 配置管理器：SQL Server Configuration Manager，打开协议 Protocols
6. 允许命名管道 "named pipes" 和 "tcp/ip"
7. 右键点击 "tcp/ip"，打开属性 Properties 标签 "IP addresses"
8. 在 TCP 动态端口 "TCP Dynamic Ports" 填入 1433（经过测试，其实这里可以不填的）
9. 重启 SQL Server、IIS和PHP
10.用主机名 端口号来连接的，mssql_connect("localhost,1433", "sa", "");（我试了一下，不用也
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