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functions.php
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functions.php
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<?php
session_start();
// connect to database
include('conn.php');
// variable declaration
$username = "";
$email = "";
$errors = array();
$success = "";
$success = array();
// call the register() function if register_btn is clicked
if (isset($_POST['register_btn'])) {
register();
}
// call the login() function if register_btn is clicked
if (isset($_POST['login_btn'])) {
login();
}
if (isset($_POST['Glogin_btn'])) {
Glogin();
}
if (isset($_GET['receiver'])) {
$_SESSION['receiver'] = $_GET['receiver'];
$roomName = $_SESSION['user']['username'].$_SESSION['receiver'];
$roomName2 = $_SESSION['receiver'].$_SESSION['user']['username'];
$userid = $_SESSION["user"]["user_id"];
$username = $_SESSION["user"]["username"];
$queryP = "SELECT * FROM login_details WHERE room='$roomName' LIMIT 1";
$resultsP = mysqli_query($conn, $queryP);
if (mysqli_num_rows($resultsP) == 0){
$queryP = "INSERT INTO login_details (user_id, username, room) VALUES('$userid', '$username', '$roomName')";
mysqli_query($conn, $queryP);
}
}
if (isset($_GET['logout'])) {
$user_id2 = $_SESSION["user"]["user_id"];
$query9 = "UPDATE users SET online='offline' WHERE user_id='$user_id2' ";
mysqli_query($conn, $query9);
session_destroy();
unset($_SESSION['user']);
unset($_SESSION['group']);
header("location: ../login.php");
}
if (isset($_GET['logout-group'])) {
unset($_SESSION['group']);
//header("location: ../login.php");
}
// REGISTER USER
function register(){
global $conn, $errors, $success;
// receive all input values from the form
$username = e($_POST['username']);
$email = e($_POST['email']);
$password_1 = e($_POST['password_1']);
$password_2 = e($_POST['password_2']);
// form validation: ensure that the form is correctly filled
if (empty($username)) {
array_push($errors, "Username is required");
}
if (empty($email)) {
array_push($errors, "Email is required");
}
if (empty($password_1)) {
array_push($errors, "Password is required");
}
if ($password_1 != $password_2) {
array_push($errors, "The two passwords do not match");
}
$query1 = "SELECT * FROM users WHERE username='$username'";
$results1 = mysqli_query($conn, $query1);
$query2 = "SELECT * FROM users WHERE email='$email'";
$results2 = mysqli_query($conn, $query2);
if (mysqli_num_rows($results1) == 1) { // user found
array_push($errors, "Username taken!");
}
if (mysqli_num_rows($results2) == 1) { // user found
array_push($errors, "Email already registered!");
}
// register user if there are no errors in the form
if (count($errors) == 0) {
$password = md5($password_1);//encrypt the password before saving in the database
$offline = "offline";
$query = "INSERT INTO users (username, email, password, online)
VALUES('$username', '$email', '$password', '$offline')";
mysqli_query($conn, $query);
array_push($success, "successfully registered!");
$_SESSION['success'] = "You are now logged in";
}
}
// return user array from their id
function getUserById($id){
global $conn;
$query = "SELECT * FROM users WHERE id=" . $id;
$result = mysqli_query($conn, $query);
$user = mysqli_fetch_assoc($result);
return $user;
}
// LOGIN USER
function login(){
global $conn, $username, $errors;
// grap form values
$username = e($_POST['username']);
$password = e($_POST['password']);
// make sure form is filled properly
if (empty($username)) {
array_push($errors, "Username is required");
}
if (empty($password)) {
array_push($errors, "Password is required");
}
// attempt login if no errors on form
if (count($errors) == 0) {
$password = md5($password);
$query = "SELECT * FROM users WHERE username='$username' AND password='$password' LIMIT 1";
$results = mysqli_query($conn, $query);
if (mysqli_num_rows($results) == 1) { // user found
$logged_in_user = mysqli_fetch_assoc($results);
$_SESSION['user'] = $logged_in_user;
$_SESSION['success'] = "You are now logged in";
$user_id = $_SESSION["user"]["user_id"];
$query8 = "UPDATE users SET online='online' WHERE user_id='$user_id' ";
mysqli_query($conn, $query8);
header('location: index.php');
}else {
array_push($errors, "Wrong username/password combination");
}
}
}
function isLoggedIn()
{
if (isset($_SESSION['user'])) {
return true;
}else{
return false;
}
}
// escape string
function e($val){
global $conn;
return mysqli_real_escape_string($conn, trim($val));
}
function display_error() {
global $errors;
if (count($errors) > 0){
echo '<div class="error">';
foreach ($errors as $error){
echo $error .'<br>';
}
echo '</div>';
}
}
function display_success() {
global $success;
if (count($success) > 0){
echo '<div class="success">';
foreach ($success as $success){
echo $success .'<br>';
}
echo '</div>';
}
}
function isLoggedInGroup()
{
if (isset($_SESSION['group'])) {
return true;
}else{
return false;
}
}
// LOGIN USER
function Glogin(){
global $conn, $username;
// grap form values
$groupname = e($_POST['groupname']);
$gpassword = e($_POST['Gpassword']);
$password = md5($gpassword);
$queryg = "SELECT * FROM groups WHERE gname='$groupname' AND password='$password' LIMIT 1";
$resultsg = mysqli_query($conn, $queryg);
if (mysqli_num_rows($resultsg) == 1) { // group found
$logged_in_group = mysqli_fetch_assoc($resultsg);
$_SESSION['group'] = $logged_in_group;
$groupid = $_SESSION["group"]["id"];
$userid = $_SESSION["user"]["user_id"];
$username = $_SESSION["user"]["username"];
$groupname = $_SESSION["group"]["gname"];
$queryl = "SELECT * FROM login_details WHERE user_id='$userid' AND gname='$groupname' LIMIT 1";
$resultsl = mysqli_query($conn, $queryl);
if (mysqli_num_rows($resultsl) == 0) {
$query5 = "INSERT INTO login_details (group_id, user_id, username, gname)
VALUES('$groupid','$userid', '$username', '$groupname')";
mysqli_query($conn, $query5);
}
unset($_SESSION['r-g']);
header('location: chats/chatBox.php');
}else {
echo "<script type='text/javascript'>alert('Wrong password!')</script>";
header('location: chats/login.php');
// header( "Refresh:1; url=chats/chatBox.php", true, 303);
}
}
?>