root/layouts/navbar.php

        
<!-- Navbar -->
<nav class="main-header navbar navbar-expand-md navbar-light navbar-white">
  <div class="container">
    <a href="#" class="navbar-brand">
      <img src="../assets/dist/img/AdminLTELogo.png" alt="AdminLTE Logo" class="brand-image img-circle elevation-3" style="opacity: .8">
      <span class="brand-text font-weight-light">Aplikasi Pengelolaan Loundry</span>
    </a>

    <button class="navbar-toggler order-1" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse order-3" id="navbarCollapse">
      <!-- Left navbar links -->
      <ul class="navbar-nav">
        <?php if($_SESSION['role']=="admin"){ ?>
          <li class="nav-item">
            <a href="index.php" class="nav-link">Home</a>
          </li>       
          <li class="nav-item dropdown">
            <a id="dropdownSubMenu1" href="#" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" class="nav-link dropdown-toggle">Data Master</a>
            <ul aria-labelledby="dropdownSubMenu1" class="dropdown-menu border-0 shadow">
              <li><a href="outlet.php" class="dropdown-item">Data Outlet</a></li>
              <li><a href="paket.php" class="dropdown-item">Data Paket</a></li>
              <li><a href="pengguna.php" class="dropdown-item">Data Pengguna</a></li>
            </ul>
          </li> 
          <li class="nav-item">
            <a href="pelanggan.php" class="nav-link">Registrasi Pelanggan</a>
          </li>
          <li class="nav-item">
            <a href="transaksi.php" class="nav-link">Entri Transaksi</a>
          </li>
          <li class="nav-item">
            <a href="laporan.php" class="nav-link">Laporan</a>
          </li>
        <?php } ?>

        <?php if($_SESSION['role']=="kasir"){ ?>
          <li class="nav-item">
            <a href="index.php" class="nav-link">Home</a>
          </li> 
          <li class="nav-item">
            <a href="pelanggan.php" class="nav-link">Registrasi Pelanggan</a>
          </li>
          <li class="nav-item">
            <a href="transaksi.php" class="nav-link">Entri Transaksi</a>
          </li>
          <li class="nav-item">
            <a href="laporan.php" class="nav-link">Laporan</a>
          </li>
        <?php } ?>

        <?php if($_SESSION['role']=="owner"){ ?>
          <li class="nav-item">
            <a href="index.php" class="nav-link">Home</a>
          </li>
          <li class="nav-item">
            <a href="laporan.php" class="nav-link">Laporan</a>
          </li>
        <?php } ?>
      </ul>
    </div>

    <!-- Right navbar links -->
    <ul class="order-1 order-md-3 navbar-nav navbar-no-expand ml-auto">
      <!-- Messages Dropdown Menu -->
      <li class="nav-item">
        <a class="nav-link" href="../logout.php">
          <i class="fas fa-user"></i> Logout
        </a>
      </li>
    </ul>
  </div>
</nav>