<?php
$conn = dbx_connect(DBX_MYSQL, "host", "database", "user", "pass")
or die("unable to connect");
$result = dbx_query($conn, "SELECT ... ", DBX_RESULT_ASSOC)
or die("query failed: ".dbx_error($conn));
foreach ($result->data as $row) {
echo " $row[id] ... ";
}