how do connect MsAccess Database in php?

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PHP

ODBC

I try to connect 'dbname' database using php.
my current code is below.
$conn = odbc_connect("Driver={Microsoft Access Driver (*.mdb)};Dbq='C:\xampp\htdocs\test\dbname.accdb'", '', '');
if (!$conn)
{
exit("Connection Failed: " . $conn);
}
?>

when i trying to connect at that time following error show.

Warning: odbc_connect() [function.odbc-connect]:
SQL error: [Microsoft][ODBC Microsoft Access Driver] Not a valid file name., SQL state S1000 in SQLConnect in C:\xampp\htdocs\test\odbc.php on line 3
Connection Failed:

please tell me how to solved this problem??