安装概要：

1.安装odbc驱动程序

2.安装语言的环境（如果已经安装了，可以跳过）

3.安装sqlserver驱动

详情：

1.安装odbc

    官网（安装 Microsoft ODBC Driver for SQL Server (Linux) - ODBC Driver for SQL Server | Microsoft Docs）这个目录

选择对应的服务器版本

以Red Hat 为例

依次运行以下命令：

sudo su

#Download appropriate package for the OS version
#Choose only ONE of the following, corresponding to your OS version

#RedHat Enterprise Server 6
curl https://packages.microsoft.com/config/rhel/6/prod.repo > /etc/yum.repos.d/mssql-release.repo

#RedHat Enterprise Server 7 and Oracle Linux 7
curl https://packages.microsoft.com/config/rhel/7/prod.repo > /etc/yum.repos.d/mssql-release.repo

#RedHat Enterprise Server 8 and Oracle Linux 8
curl https://packages.microsoft.com/config/rhel/8/prod.repo > /etc/yum.repos.d/mssql-release.repo

exit
sudo yum remove unixODBC-utf16 unixODBC-utf16-devel #to avoid conflicts
sudo ACCEPT_EULA=Y yum install msodbcsql17
# optional: for bcp and sqlcmd
sudo ACCEPT_EULA=Y yum install mssql-tools
echo 'export PATH="$PATH:/opt/mssql-tools/bin"' >> ~/.bash_profile
echo 'export PATH="$PATH:/opt/mssql-tools/bin"' >> ~/.bashrc
source ~/.bashrc
# optional: for unixODBC development headers
sudo yum install unixODBC-devel

2.安装sqlserver驱动（我已经安装了对应语言的环境：php）

刚才的官网页面点击

选择对应的语言

以php点击进去为例：

选择要安装的服务器

同样选择对应的版本

然后它上面有详细的步骤

我已经安装好了php运行的环境所以直接安装驱动

sudo pecl install sqlsrv
sudo pecl install pdo_sqlsrv
sudo su
echo extension=pdo_sqlsrv.so >> `php --ini | grep "Scan for additional .ini files" | sed -e "s|.*:\s*||"`/30-pdo_sqlsrv.ini
echo extension=sqlsrv.so >> `php --ini | grep "Scan for additional .ini files" | sed -e "s|.*:\s*||"`/20-sqlsrv.ini
exit

然后就可以连接sqlserver了，php有时候安装会说某函数用不了，就要去php里面开启.