$server="systemdnsfile1"; #the name of the iSeries
$user="user"; #a valid username that will connect to the DB
$pass="pass"; #a password for the username
$conn=odbc_connect($server,$user,$pass); #you may have to remove quotes

@n$db = @new PDO(
            "mysql:host={$sql_details['host']};dbname={$sql_details['db']}",
            $sql_details['user'],
            $sql_details['pass'],
            array( PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION )
        );