Problem Querying using PDO

Hi,

I am trying to use PDO like this simple code:

<?php
	$mysql_host			=	"(local)\JASSIM-RAHMA";
	$mysql_database 	=	array("Database"=>"food");

	$mysql_connection	= sqlsrv_connect($mysql_host, $mysql_database);

	$sql_stmt			= "SELECT * FROM  groups";

	$mysql_query		= sqlsrv_query($mysql_connection, $sql_stmt);

	while($row = sqlsrv_fetch_array($mysql_query, SQLSRV_FETCH_ASSOC))
	{
		echo $row['group_id'].", ".$row['group_name']."<br />";
	}
?>

but I am getting:

Warning: sqlsrv_query() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\food\temp.php on line 9

Warning: sqlsrv_fetch_array() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\food\temp.php on line 11

Kindly help..

Thanks,

Jassim