我想在Microsoft SQL Server与主机中的Codeigniter 3.1.9中的Php 7.0.32之间建立连接

I can not connect from Codeigniter 3.1.9 to Microsoft SQL server in Php 7.0.32.

I already installed SQL driver in xampp and also write this two files in "php.ini". Files name are "php_sqlsrv_7_ts.dll", "php_pdo_sqlsrv_7_ts.dll", this two files I add in Xampp > Php > ext directory. And write in php.ini is this "extension=php_sqlsrv_7_ts.dll", "extension=php_pdo_sqlsrv_7_ts.dll". But when I open my project that time show to me "Unable to connect to your database server using the provided settings.

Filename: E:/xampp/htdocs/shrachi-crm/system/database/DB_driver.php Line Number: 436".

Please help me.