function add_friend($sender, $new_friend)
{
if (account_exists($new_friend)) {
if (!already_friend($sender, $new_friend)) {
add_friend_to_db($sender, $new_friend);
print "";
} else {
print "<div id=" . "output" . "> Oh, haha. You're friends with this guy already. </div>";
}
} else {
print "<div id=" . "output" . "> That friend doesn't exist. Try a different friend? </div>";
}
}
<?php
require_once "../includes/session.php";
require_once "../includes/db_connection.php";
require_once "../includes/functions.php";
if (!isset($_SESSION["user_id"])) {
set_error_output("Please log in to add friend. ", "log_in.php");
} else {
if (!isset($_GET["user"])) {
set_error_output("Invalid friend. ", "index.php");
} else {
if ($_SESSION["user_id"] == $_GET["user"]) {
set_error_output("Cannot add yourself to your own friends list. ", "index.php");
} else {
if (already_friend($_SESSION["user_id"], $_GET["user"])) {
set_error_output("That user is already on your friends list. ", "user.php?user="******"user"]));
}
}
}
}
add_friend($_SESSION["user_id"], $_GET["user"]);
redirect_to("user.php?user="******"user_id"]);