This is how to do it without the library, though you will need the JSON RPC Client, found here:
http://jsonrpcphp.org/?page=download&lang=en<?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);
?>
Then you have a list of functions you can do with their parameters here:
https://en.bitcoin.it/wiki/Original_Bitcoin_client/API_Calls_listFor example for what you want to do:
<?php
$bitcoin->sendtoaddress(<bitcoinaddress>, <amount>);
?>
Make sure the amount is not a string or you will get errors. Remember you can use the commands from that website in place of "sendtoaddress" to fit your needs.