centos7 php连sqlserver不是很常见，但是也会有这样的需求
1，安装remi源
- # rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
- # rpm --import http://rpms.famillecollet.com/RPM-GPG-KEY-remi
2，安装microsoft源
- # curl https://packages.microsoft.com/config/rhel/7/prod.repo > /etc/yum.repos.d/mssql-release.repo
3，安装msodbcsql17，mssql-tools，unixODBC-devel
- # ACCEPT_EULA=Y yum install -y msodbcsql17
- # ACCEPT_EULA=Y yum install -y mssql-tools
- # yum install -y unixODBC-devel
4，安装sqlsrv
- # yum search sqlsrv
- # yum install php71w-pdo_dblib php71-php-sqlsrv
- # systemctl restart php-fpm
- # php -m | grep dblib
- pdo_dblib