php 链接access数据库

<?php

$odbc = "Driver={Microsoft Access Driver (*.mdb)};Dbq=".realpath("test.mdb");  
$conn = odbc_connect($odbc, ‘‘, ‘‘, SQL_CUR_USE_ODBC);  
$sql ="select * from user";  
$query = odbc_exec($conn, $sql);  
$num = odbc_num_fields($query);
echo "<table><tr><th>ID</th><th>username</th><th>password</th></tr>";
while ($row = odbc_fetch_row($query)) 
{
    echo "<tr>";
    echo "<td>".odbc_result($query,"id")."</td>";
    echo "<td>".odbc_result($query,"username")."</td>";
    echo "<td>".odbc_result($query,"password")."</td>";
    echo "</tr>";
}
echo "</table>";
?>