include_once("Bitcoin.php");

$rpcUser = "username";
$rpcPass = "password";
$url = "http://localhost:8332";
$address = "whatever";
$amount = 5;

$bitcoin = new Bitcoin($url, $rpcUser, $rpcPass);

$bitcoin->sendToAddress($address, $amount); 

<?php
require_once "classes/jsonRPCClient.php";

define ("BC_HOST", "127.0.0.1"); // set bc client addy
define ("BC_USER", "user"); // set rpc user
define ("BC_PASS", "pass"); // set rpc password
define ("BC_PORT", "8332"); // set rpc port

$bitcoin = new jsonRPCClient("http://".BC_USER.":".BC_PASS."@".BC_HOST.":".BC_PORT);
?>

<?php
$bitcoin->sendtoaddress(<bitcoinaddress>, <amount>);
?>