index.php

<?php
/*
 * Created on Mon May 10 2021
 *
 * The MIT License (MIT)
 * Copyright (c) 2021 MartDevelopers Inc
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

require_once './config.php';
if (isset($_SESSION["user_id"]) && $_SESSION["user_id"] != "") {
  // user already logged in the site
  header("location:" . SITE_URL . "home.php");
}
include './header.php';
?>
<div class="container">
  <div class="margin10"></div>

  <?php if ($_SESSION["e_msg"] <> "") { ?>
    <div class="alert alert-dismissable alert-danger">
      <button data-dismiss="alert" class="close" type="button">x</button>
      <p><?php echo $_SESSION["e_msg"]; ?></p>
    </div>
  <?php } ?>

  <div class="col-sm-3 col-sm-offset-4">
    <a class="btn btn-block btn-social btn-google-plus" href="login.php">
      <i class="fa fa-google-plus"></i> Login with Google
    </a>
  </div>
</div>
<?php
include './footer.php';
// unset if after it display the error.
$_SESSION["e_msg"] = "";
?>