我服务器上的文件在哪里？

I'm connecting to my access database using PHP. My access file is located here in the server:

e:\home\sbpsp2\dados\fichas\jornada_xyz.mdb

then... here is the code

$dbName = $_SERVER["DOCUMENT_ROOT"] . "dados\fichas\jornada_xyz.mdb";
if (!file_exists($dbName)) {
    die("Could not find database file.");
}
$db = new PDO("odbc:DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=$dbName; Uid=; Pwd=;");

I always get "Could not find database file", already tried different things on the first line.

$_SERVER["DOCUMENT_ROOT"]

Does not mean your file system root. That's web server specific setting. If your document root is not e:\home\sbpsp2 then the path it generates is incorrect. Use absolute path

$dbName = "e:\home\sbpsp2\dados\fichas\jornada_xyz.mdb";