<?php
$host="***";
$dbusername="***";
$dbpassword="***";
//База данни 1
$db1="***";
//База данни 2
$db2="***";
//И слагаш още такива редове, колкото бази данни искаш
$db_conn1 = mysql_connect("$host", "$dbusername", "$dbpassword") or die("unable to connect to the database");
mysql_select_db("$db1", $db_conn1) or die("unable to select the database");
$sql1="select * from tablica1";
$result1= mysql_query($sql1);
$row1=mysql_fetch_array($result1);
$db_conn2 = mysql_connect("$host", "$dbusername", "$dbpassword") or die("unable to connect to the database");
mysql_select_db("$db2", $db_conn2) or die("unable to select the database");
$sql2="select * from tablica2";
$result2= mysql_query($sql2);
$row2=mysql_fetch_array($result2);
?>
<table border="1">
<tr>
<td>Ot pyrva BD</td><td><?php echo $row1['pole_ot_tablica1']; ?></td>
</tr>
<tr>
<td>Ot vtora BD</td><td><?php echo $row2['pole_ot_tablica2']; ?></td>
</tr>
</table>
Само червените неща трябва да си промениш.