public function main_view(){

    echo"

  <!-- Navbar -->
  <nav class='main-header navbar navbar-expand bg-white navbar-light border-bottom'>
    <!-- Left navbar links -->
    <ul class='navbar-nav'>
      <li class='nav-item'>
        <a class='nav-link' data-widget='pushmenu' href='#'><i class='fa fa-bars'></i></a>
      </li>
      <li class='nav-item d-none d-sm-inline-block'>
        <a href='index3.html' class='nav-link'>Home</a>
      </li>
      <li class='nav-item d-none d-sm-inline-block'>
        <a href='#' class='nav-link'>Contact</a>
      </li>
    </ul>

    <!-- SEARCH FORM -->
    <form class='form-inline ml-3'>
      <div class='input-group input-group-sm'>
        <input class='form-control form-control-navbar' type='search' placeholder='Search' aria-label='Search'>
        <div class='input-group-append'>
          <button class='btn btn-navbar' type='submit'>
            <i class='fa fa-search'></i>
          </button>
        </div>
      </div>
    </form>

    <!-- Right navbar links -->
    <ul class='navbar-nav ml-auto'>
      <!-- Messages Dropdown Menu -->
      <li class='nav-item dropdown'>
        <a class='nav-link' data-toggle='dropdown' href='#'>
          <i class='fa fa-comments-o'></i>
          <span class='badge badge-danger navbar-badge'>3</span>
        </a>
        <div class='dropdown-menu dropdown-menu-lg dropdown-menu-right'>
          <a href='#' class='dropdown-item'>
            <!-- Message Start -->
            <div class='media'>
              <img src='../sip-native/lte/dist/img/user1-128x128.jpg' alt='User Avatar' class='img-size-50 mr-3 img-circle'>
              <div class='media-body'>
                <h3 class='dropdown-item-title'>
                  Brad Diesel
                  <span class='float-right text-sm text-danger'><i class='fa fa-star'></i></span>
                </h3>
                <p class='text-sm'>Call me whenever you can...</p>
                <p class='text-sm text-muted'><i class='fa fa-clock-o mr-1'></i> 4 Hours Ago</p>
              </div>
            </div>
            <!-- Message End -->
          </a>
          <div class='dropdown-divider'></div>
          <a href='#' class='dropdown-item'>
            <!-- Message Start -->
            <div class='media'>
              <img src='../sip-native/lte/dist/img/user8-128x128.jpg' alt='User Avatar' class='img-size-50 img-circle mr-3'>
              <div class='media-body'>
                <h3 class='dropdown-item-title'>
                  John Pierce
                  <span class='float-right text-sm text-muted'><i class='fa fa-star'></i></span>
                </h3>
                <p class='text-sm'>I got your message bro</p>
                <p class='text-sm text-muted'><i class='fa fa-clock-o mr-1'></i> 4 Hours Ago</p>
              </div>
            </div>
            <!-- Message End -->
          </a>
          <div class='dropdown-divider'></div>
          <a href='#' class='dropdown-item'>
            <!-- Message Start -->
            <div class='media'>
              <img src='../sip-native/lte/dist/img/user3-128x128.jpg' alt='User Avatar' class='img-size-50 img-circle mr-3'>
              <div class='media-body'>
                <h3 class='dropdown-item-title'>
                  Nora Silvester
                  <span class='float-right text-sm text-warning'><i class='fa fa-star'></i></span>
                </h3>
                <p class='text-sm'>The subject goes here</p>
                <p class='text-sm text-muted'><i class='fa fa-clock-o mr-1'></i> 4 Hours Ago</p>
              </div>
            </div>
            <!-- Message End -->
          </a>
          <div class='dropdown-divider'></div>
          <a href='#' class='dropdown-item dropdown-footer'>See All Messages</a>
        </div>
      </li>
      <!-- Notifications Dropdown Menu -->
      <li class='nav-item dropdown'>
        <a class='nav-link' data-toggle='dropdown' href='#'>
          <i class='fa fa-bell-o'></i>
          <span class='badge badge-warning navbar-badge'>15</span>
        </a>
        <div class='dropdown-menu dropdown-menu-lg dropdown-menu-right'>
          <span class='dropdown-header'>15 Notifications</span>
          <div class='dropdown-divider'></div>
          <a href='#' class='dropdown-item'>
            <i class='fa fa-envelope mr-2'></i> 4 new messages
            <span class='float-right text-muted text-sm'>3 mins</span>
          </a>
          <div class='dropdown-divider'></div>
          <a href='#' class='dropdown-item'>
            <i class='fa fa-users mr-2'></i> 8 friend requests
            <span class='float-right text-muted text-sm'>12 hours</span>
          </a>
          <div class='dropdown-divider'></div>
          <a href='#' class='dropdown-item'>
            <i class='fa fa-file mr-2'></i> 3 new reports
            <span class='float-right text-muted text-sm'>2 days</span>
          </a>
          <div class='dropdown-divider'></div>
          <a href='#' class='dropdown-item dropdown-footer'>See All Notifications</a>
        </div>
      </li>
      <li class='nav-item'>
        <a class='nav-link' data-widget='control-sidebar' data-slide='true' href='#'><i
            class='fa fa-th-large'></i></a>
      </li>
    </ul>
  </nav>
  <!-- /.navbar -->

  <!-- Main Sidebar Container -->
  <aside class='main-sidebar sidebar-dark-primary elevation-4'>
    <!-- Brand Logo -->
    <a href='index3.html' class='brand-link'>
      <img src='../sip-native/lte/dist/img/AdminLTELogo.png' alt='AdminLTE Logo' class='brand-image img-circle elevation-3'
           style='opacity: .8'>
      <span class='brand-text font-weight-light'>AdminLTE 3</span>
    </a>

    <!-- Sidebar -->
    <div class='sidebar'>
      <!-- Sidebar user panel (optional) -->
      <div class='user-panel mt-3 pb-3 mb-3 d-flex'>
        <div class='image'>
          <img src='../sip-native/lte/dist/img/user2-160x160.jpg' class='img-circle elevation-2' alt='User Image'>
        </div>
        <div class='info'>
          <a href='#' class='d-block'>Alexander Pierce</a>
        </div>
      </div>

      <!-- Sidebar Menu -->
      <nav class='mt-2'>
        <ul class='nav nav-pills nav-sidebar flex-column' data-widget='treeview' role='menu' data-accordion='false'>
          <!-- Add icons to the links using the .nav-icon class
               with font-awesome or any other icon font library -->
          <li class='nav-item has-treeview menu-open'>
            <a href='#' class='nav-link active'>
              <i class='nav-icon fa fa-dashboard'></i>
              <p>
                Starter Pages
                <i class='right fa fa-angle-left'></i>
              </p>
            </a>
            <ul class='nav nav-treeview'>
              <li class='nav-item'>
                <a href='#' class='nav-link active'>
                  <i class='fa fa-circle-o nav-icon'></i>
                  <p>Active Page</p>
                </a>
              </li>
              <li class='nav-item'>
                <a href='#' class='nav-link'>
                  <i class='fa fa-circle-o nav-icon'></i>
                  <p>Inactive Page</p>
                </a>
              </li>
            </ul>
          </li>
          <li class='nav-item'>
            <a href='#' class='nav-link'>
              <i class='nav-icon fa fa-th'></i>
              <p>
                Simple Link
                <span class='right badge badge-danger'>New</span>
              </p>
            </a>
          </li>
        </ul>
      </nav>
      <!-- /.sidebar-menu -->
    </div>
    <!-- /.sidebar -->
  </aside>

  <!-- Content Wrapper. Contains page content -->
  <div class='content-wrapper'>
    <!-- Content Header (Page header) -->
    <div class='content-header'>
      <div class='container-fluid'>
        <div class='row mb-2'>
          <div class='col-sm-6'>
            <h1 class='m-0 text-dark'>Starter Page</h1>
          </div><!-- /.col -->
          <div class='col-sm-6'>
            <ol class='breadcrumb float-sm-right'>
              <li class='breadcrumb-item'><a href='#'>Home</a></li>
              <li class='breadcrumb-item active'>Starter Page</li>
            </ol>
          </div><!-- /.col -->
        </div><!-- /.row -->
      </div><!-- /.container-fluid -->
    </div>
    <!-- /.content-header -->

    <!-- Main content -->
    <div class='content'>
      <div class='container-fluid'>
        <div class='row'>
          <div class='col-lg-6'>
            <div class='card'>
              <div class='card-body'>
                <h5 class='card-title'>Card title</h5>

                <p class='card-text'>
                  Some quick example text to build on the card title and make up the bulk of the card's
                  content.
                </p>

                <a href='#' class='card-link'>Card link</a>
                <a href='#' class='card-link'>Another link</a>
              </div>
            </div>

            <div class='card card-primary card-outline'>
              <div class='card-body'>
                <h5 class='card-title'>Card title</h5>

                <p class='card-text'>
                  Some quick example text to build on the card title and make up the bulk of the card's
                  content.
                </p>
                <a href='#' class='card-link'>Card link</a>
                <a href='#' class='card-link'>Another link</a>
              </div>
            </div><!-- /.card -->
          </div>
          <!-- /.col-md-6 -->
          <div class='col-lg-6'>
            <div class='card'>
              <div class='card-header'>
                <h5 class='m-0'>Featured</h5>
              </div>
              <div class='card-body'>
                <h6 class='card-title'>Special title treatment</h6>

                <p class='card-text'>With supporting text below as a natural lead-in to additional content.</p>
                <a href='#' class='btn btn-primary'>Go somewhere</a>
              </div>
            </div>

            <div class='card card-primary card-outline'>
              <div class='card-header'>
                <h5 class='m-0'>Featured</h5>
              </div>
              <div class='card-body'>
                <h6 class='card-title'>Special title treatment</h6>

                <p class='card-text'>With supporting text below as a natural lead-in to additional content.</p>
                <a href='#' class='btn btn-primary'>Go somewhere</a>
              </div>
            </div>
          </div>
          <!-- /.col-md-6 -->
        </div>
        <!-- /.row -->
      </div><!-- /.container-fluid -->
    </div>
    <!-- /.content -->
  </div>
  <!-- /.content-wrapper -->

  <!-- Control Sidebar -->
  <aside class='control-sidebar control-sidebar-dark'>
    <!-- Control sidebar content goes here -->
    <div class='p-3'>
      <h5>Title</h5>
      <p>Sidebar content</p>
    </div>
  </aside>
  <!-- /.control-sidebar -->

  <!-- Main Footer -->
  <footer class='main-footer'>
    <!-- To the right -->
    <div class='float-right d-none d-sm-inline'>
      Anything you want
    </div>
    <!-- Default to the left -->
    <strong>Copyright &copy; 2014-2018 <a href='https://adminlte.io'>AdminLTE.io</a>.</strong> All rights reserved.
  </footer>
    ";

  }