<?php

$driver='{ODBC Driver 17 for SQL Server}';
/* $driver='{ODBC Driver 13 for SQL Server}'; */
/* $driver='{ODBC Driver 11 for SQL Server}'; */
$dsn='phpodbc11';
$hostname='host01';
$database='data01';
$username='root';
$password='pass123';

$conn = new PDO("odbc:$dns")
$conn = new PDO("dblib:host=$hostname;dbname=$database", $username,$password);
$conn = new PDO("sqlsrv:Server=$hostname;Database=$database", $username, $password);
$conn = new PDO("odbc:Driver=$driver;Server=$hostname;Database=$database", $username, $password);

?>