Please try this setting:

$db_conf = array();
$db_conf["type"] = "pdo";
$db_conf["server"] = "odbc:Driver=........"; 
$db_conf["user"] = 'USER'; // username
$db_conf["password"] = 'PASS'; // password
$db_conf["database"] = 'INVENTORY'; // database

Another option is to setup PDO for snowflakedb.

https://github.com/snowflakedb/pdo_snowflake

And this PDO connection sample code: https://www.gridphp.com/demo/demos/loading/db-layer-pdo.phps

I tried with changing this:

$db_conf["type"] = "pdo";
$db_conf["server"] = "odbc:Driver=........"; 

I still get this error though:
“Please check your database connection configuration. Connection attempt failed: SQLSTATE[01000] SQLDriverConnect: 0 [unixODBC][Driver Manager]Can’t open lib ‘snowflakedb’ : file not found”

snowflakedb is the name of my DSN which has the DB, warehouse, role defined. I don’t know if a DSN needs to be called or referenced in a different manner for this grid code?

Please test your PHP connectivity with Snowflakedb in an empty php file (without datagrid), then share that code here and I’ll update you back the datagrid connection settings.

Perfect, the configuration example you provided below works! The grid loads with the data from Snowflake.
Thank you so much Abu!

Sharing here for the benefit of others:

$db_conf = array();
$db_conf["type"] = "odbc";
$db_conf["server"] = "snowflakedb";
$db_conf["user"] = "$user"; //username from ENV
$db_conf["password"] = "$password"; //password from ENV
$db_conf["database"] = ""; //keep it blank

Notes:
User and pass are set as system environment variables.
Retrieved like the following:
$user = getenv(“user”);

Server in my case is defined in the snowflake odbc.ini in the /etc directory. It has the server name, port, warehouse, role and other necessary info. The DSN name is snowflakedb so that is what is listed for the server.
$db_conf[“server”] = “snowflakedb”;