/mybookbag/processrequest.php

<?php
session_start();
include('functions.php');
if(!isset($_POST["submit"])){
	header("Location: addfriend.php");
	}

else{
	$username = "";
	$email = "";
	if(isset($_POST["username"])){
		$username = $_POST["username"];
		}
	else{
		$username = "";
		}
	if(isset($_POST["email"])){
		$email = $_POST["email"];
		}
	else{
		$email = "";
		}
	echo "username=$username";
	echo "email=$email";
	$targetid = determineTarget($username,$email); //Get id of targetuser
	if(!$targetid){
		$_SESSION["addresult"] = "Could not process your request somehow.";
		header("Location: addfriend.php");
		}
	else{
		if(verifyRequest($targetid)){ //Check if $id is accepted (if you're not trying to add yourself)
			$query = "insert into `friend_of`(`p_id`,`friend_id`,`accepted`) values({$_SESSION["id"]},{$targetid},1)";
			$handle = mysql_query($query);
			if(!$handle){ //If query failed, create message accordingly
				$_SESSION["addresult"] = "Could not process your request somehow. Perhaps you already tried to add this person or you are already friends with him or her.";

				}
			else{	//If not, create message accordingly
				$_SESSION["addresult"] = "Request sent!";
				}


			}
		else{ //If you tried to add yourself, create according message.
			$_SESSION["addresult"] = "You cannot add yourself you friendless bastard!";
			}
		header("Location: friends.php");

		}
	}
function verifyRequest($targetid){ //Returns a boolean
return($_SESSION["id"]!=$targetid);
}
?>