PHP uses sqlserver

1、 install ODBC Program
Official download address ：Download ODBC Driver for SQL Server - ODBC Driver for SQL Server | Microsoft Docs
2、 download sqlsrv Extension files
Official download address ：Download the Microsoft Drivers for PHP for SQL Server - PHP drivers for SQL Server | Microsoft Docs
3、 Move the version corresponding to the extension file to PHP Under the corresponding directory ext Catalog ;
4、 change PHP Configuration file for , Add extensions ,（ With php7.4 For example ）
extension=php_pdo_sqlsrv_74_ts_x64
extension=php_sqlsrv_74_ts_x64
5、 restart apache or nginx service

Pay attention to the release notes of the official documents , That is to use sqlserver Of php Drive and operating system and php Version related requirements
https://docs.microsoft.com/zh-cn/sql/connect/php/release-notes-php-sql-driver?view=sql-server-ver16#previous-releases

When you don't install ODBC The program may not be configured sqlsrv file , Will return to Microsoft official download ODBC Links or tips for sqlsrv Function undefined

After the above two things are done, you may encounter errors ：

[08001] [Microsoft][SQL Server Native Client 11.0]TCP Provider : Because the target computer actively refuses , Unable to connect .\r\n (10061) (SQLDriverConnect); [08001]
[Microsoft][SQL Server Native Client 11.0] Login timeout expired (0); [08001]
[Microsoft][SQL Server Native Client 11.0] Invalid connection string attribute (0); [08001]
[Microsoft][SQL Server Native Client 11.0] And SQL Server A network related or instance specific error occurred while establishing the connection . Unable to find or access the server . Please check whether the instance name is correct and SQL Server Whether it is configured to allow remote connections .

Don't worry about this , It's just that there is a problem filling in values such as user name and password
In addition, it is probably the port number
because sqlserver Network configured tcp/ip The default port in is 1433

Let's see if the connection port in your code is 1433（127.0.1.1,1433）, If you don't change the port number
In addition, there may be some port numbers that are not open .

Reference link ：
https://blog.csdn.net/u012887346/article/details/124768262
https://blog.csdn.net/u010423663/article/details/125464776
https://docs.microsoft.com/zh-cn/sql/connect/php/release-notes-php-sql-driver?view=sql-server-ver16#previous-releases