login error

<?php
session_start();
require("../mainconfig.php");
$page_type = "user_login";
$msg_type = "nothing";

if (isset($_SESSION['user'])) {
	$sess_username = $_SESSION['user']['username'];
	$check_user = mysqli_query($db, "SELECT * FROM users WHERE username = '$sess_username'");
	$data_user = mysqli_fetch_assoc($check_user);
	if (mysqli_num_rows($check_user) == 0) {
		header("Location: ".$cfg_baseurl."logout.php");
	} else if ($data_user['status'] == "Suspended") {
		header("Location: ".$cfg_baseurl."logout.php");
    }
}

    if (isset($_POST['login'])) {
		$post_username = mysqli_real_escape_string($db, trim($_POST['username']));
		$post_password = mysqli_real_escape_string($db, trim($_POST['password']));
		$pengacak="DIE64SD854F978F15DSF54FDF561SF65416541WFSWFC634165SWCFFCS";
		$cek_password=md5($pengacak).md5($post_password);
		$cek_password1=base64_encode($cek_password);
		$cek_password2=sha1($cek_password1);
		$cek_password3="S4SMED14$cek_password2";

		if (empty($post_username) || empty($post_password)) {
			$msg_type = "error";
			$msg_content = '<b>Gagal:</b> Mohon mengisi semua input.<script>swal("Ups!", "Mohon mengisi semua input.", "error");</script>';
		} else {
			$check_user = mysqli_query($db, "SELECT * FROM users WHERE username = '$post_username'");
			if (mysqli_num_rows($check_user) == 0) {
				$msg_type = "error";
				$msg_content = '<b>Gagal:</b> Username atau password salah.<script>swal("Ups!", "Username atau password salah.", "error");</script>';
			} else {
				$data_user = mysqli_fetch_assoc($check_user);
				if ($post_password <> $data_user['password']) {
					$msg_type = "error";
					$msg_content = '<b>Gagal:</b> Username atau password salah.<script>swal("Error!", "Username atau password salah.", "error");</script>';
				} else if ($data_user['status'] == "Suspended") {
					$msg_type = "error";
					$msg_content = '<b>Gagal:</b> Akun Suspended .<script>swal("Error!", "Akun Suspended.", "error");</script>';

				} else {
					$_SESSION['user'] = $data_user;
					$_SESSION['welcome'] = TRUE;
					header("Location: ".$cfg_baseurl);
				}
			}
		}
	}


include("../lib/header.php");
?>
                    <div class="row">
                        <div class="col-lg-offset-2 col-lg-8">
                            <div class="box box-success">
                                    <div class="box-header with-border">
                                      <h3 class="box-title"><i class="fa fa-sign-in"></i> Masuk</h3>
                                      <div class="box-tools pull-right">
                                        <button type="button" class="btn btn-box-tool" data-widget="collapse"><i class="fa fa-minus"></i>
                                        </button>
                                      </div>
                                    </div>
                                    <div class="box-body">
										<?php
										if ($msg_type == "error") {
										?>
										<div class="alert alert-danger">
											<a href="#" class="close" data-dismiss="alert" aria-label="close">×</a>
											<i class="fa fa-times-circle"></i>
											<?php echo $msg_content; ?>
										</div>
										<?php
										}
										?>
										<form class="form-horizontal" role="form" method="POST">
											<div class="form-group">
												<label class="col-md-3 control-label">Username</label>
												<div class="col-md-9">
													<input type="text" name="username" class="form-control" placeholder="Username">
												</div>
											</div>
											<div class="form-group">
												<label class="col-md-3 control-label">Password</label>
												<div class="col-md-9">
													<input type="password" name="password" class="form-control" placeholder="Password">
												</div>
											</div>
										    <div class="pull-right">
                                                <button type="reset" class="btn btn-danger"><i class="fa fa-refresh"></i> Ulangi </button>
                                                <button type="submit" name="login" class="btn btn-success"><i class="fa fa-send"></i> Kirim </button>
                                            </div>
                                            <br />
                                            <br />
		                                </form>
                                    </div>
                                </div>
                            </div>
                    </div>


<?php
include("../lib/footer.php");
?>