MSSQL Float Precision Problem By Using PHP Driver

I'm connecting MSSQL Server 2005 Express via MS Driver for PHP (CTP version October 2007) and sometimes I don't retrieve exact float values. For example, in database is 0.7 and I get 0.69999999999999996, but for 1.0 in database I get 1.0. The result is the same, if I use prepared statement (sqlsrv_conn_prepare() and sqlsrv_stmt_execute()) or directly sql_conn_execute().

The table definition is very simple:
CREATE TABLE [dbo].[test](
a float NOT NULL
);
insert into test values(0.7);
insert into test values(1.0);
insert into test values(1.1);
insert into test values(1.2);
insert into test values(1.3);
insert into test values(1.4);
insert into test values(1.5);
insert into test values(1.6);
insert into test values(1.7);
insert into test values(1.8);
insert into test values(1.9);
insert into test values(2.0);

And select command is:
select a from test;

PHP code:
$conn = sqlsrv_connect("localhostsqlexpress", array("UID" => "sa", "PWD" => "password"));
sqlsrv_conn_execute($conn, "USE dbname");
$stmt = sqlsrv_conn_execute($conn, "select a from test");

while($row = sqlsrv_stmt_fetch_array($stmt, SQLSRV_FETCH_TYPE_ARRAY))
echo $row[1]."; ";

Result:
0.69999999999999996; 1.0; 1.1000000000000001; 1.2; 1.3; 1.3999999999999999; 1.5; 1.6000000000000001; 1.7; 1.8; 1.8999999999999999; 2.0

Expected result:
0.7; 1.0; 1.1; 1.2; 1.3; 1.4; 1.5; 1.6; 1.7; 1.8; 1.9; 2.0

Running configuration:
Windows 2003 Server SP2, SQL Server 2005 Express SP2, IIS6, PHP 5.2.5 ISAPI

Thank you very much for help.
Vlasta