Error connecting to MSSQL from PHP [duplicate]

Good day.

PHP 7, IIS 7.5 Windows Server 2008r2 when trying to connect to MSSQL an error occurs:

PHP Fatal error: Uncaught Error: Call to undefined function sqlsrv_connect() in C:\inetpub\путь\connect.php:4 Stack trace: #0 {main} thrown in C:\путь\connect.php on line 4 

extension=php_mssql.dll no extension=php_mssql.dll directive in php.ini extension=php_mssql.dll no php.ini itself in this release, it was replaced with php.ini-development and php.ini-production

The script itself:

 $serverName = "mssql02\"; $connectionInfo = array( "Database"=>"", "UID"=>"", "PWD"=>""); $conn = sqlsrv_connect( $serverName, $connectionInfo); if( $conn ) { echo "Соединение удалось.<br />"; }else{ echo "Соединение не удалось, ошибка:"; die( print_r( sqlsrv_errors(), true)); } 

the fact that there is no server name, username, password, etc. is not an error, just removed specially

PDO downloaded, threw in the ext folder: in php config added line:

but you don't want to work

There are no PDO drivers in the phpinfo output.