Cannot connect to SQL Server with PHP script – PHP Versions

I run SQL Server 2016. I try to connect to it via a PHP script (PHP version 8). I did install the drivers and added the path in the php.ini (same version as my PHP version):

...
extension=pdo_sqlsrv_80_nts
extension=pdo_sqlsrv_80_ts
extension=sqlsrv_80_nts
extension=sqlsrv_80_ts
...

Here is my script:

$serverName = "<ServerName>";
$connectionInfo = array( "Database"=>"<database>", "UID"=>"<user>", "PWD"=>"<pwd>");
$conn = sqlsrv_connect( $serverName, $connectionInfo);

if( $conn ) {
     echo "Connection established.<br />";
}else{
     echo "Connection could not be established.<br />";
     die( print_r( sqlsrv_errors(), true));
}

I get the following error:

Array
(
    [0] => Array
        (
            [0] => IM006
            [SQLSTATE] => IM006
            [1] => 0
            [code] => 0
            [2] => [Microsoft][ODBC Driver Manager] Driver's SQLSetConnectAttr failed
            [message] => [Microsoft][ODBC Driver Manager] Driver's SQLSetConnectAttr failed
        )

    [1] => Array
        (
            [0] => 01000
            [SQLSTATE] => 01000
            [1] => 5701
            [code] => 5701
            [2] => [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Changed database context to '<database>'.
            [message] => [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Changed database context to '<database>'.
        )

    [2] => Array
        (
            [0] => 01000
            [SQLSTATE] => 01000
            [1] => 5703
            [code] => 5703
            [2] => [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Changed language setting to us_english.
            [message] => [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Changed language setting to us_english.
        )

)

Any idea what could be wrong?
Thank you for your help