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https://github.com/404labfr/laravel-impersonate
https://stackoverflow.com/questions/45049601/php-the-requested-php-extension-bcmath-is-missing-from-your-system
<?php
1)
composer require lab404/laravel-impersonate

2)
// ========== /config/app.php in providers array==============
Lab404\Impersonate\ImpersonateServiceProvider::class,


// ======= ROUTES ============
// ADMIN IMPERSONATE USERS
Route::get('admin/impersonate', 'ImpersonateController@index')->name('impersonate.index');
Route::get('admin/impersonate/{user_id}', 'ImpersonateController@impersonate')->name('impersonate');
Route::get('admin/impersonate_leave', 'ImpersonateController@impersonate_leave')->name('impersonate_leave');


// ========== User MODEL =========
use Lab404\Impersonate\Models\Impersonate ;  // Namespace
use Impersonate;  // inside controller


// ========= IMPERSONATE CONTROLLER =========
namespace App\Http\Controllers;

use Auth;
use Session;
use App\User;
use Illuminate\Http\Request;

class ImpersonateController extends Controller
{

/*_____________________________________________________
    CONSTRUCTOR - APPLY ADMIN MIDDLEWARE FOR THIS CLASS
-----------------------------------------------------*/
    public function __construct() {
        $this->middleware('admin') ;   
    }


/*________________________________________________
    LIST OF USERS TO IMPERSONATE
------------------------------------------------*/
    public function index() {
        $users = User::where('id', '!=', Auth::id() )->get();
        return view('admin.impersonate.index')->with('users' ,$users) ;
    }


/*________________________________________________
    ADMIN IMPERSONATE USERS
------------------------------------------------*/
    public function impersonate ($user_id ) {
        $user = User::find($user_id);
        Auth::user()->impersonate($user) ;
        Session::flash('info' , 'Impersonating: '. $user->name ) ;
        return redirect()->back() ;
    }

/*________________________________________________
ADMIN IMPERSONATE LEAVE
------------------------------------------------*/
    public function impersonate_leave() {
        Auth::user()->leaveImpersonation() ;
        Session::flash('success', 'Back to Admin Account') ;
        return redirect()->back() ; 
    }

}


// ============ IMPERSONATOR VIEW =============
@forelse($users as $user)
    <tr>
        <td>{{ $user->id }}</td>
        <td>
              <span><img src="{{ url('/profile') . '/' . $user->profile }}" class="leaderboard_image"></span>
              <span>{{ $user->username }}</span>                            
      
          </td>
          <td>{{ $user->email }}</td>
          <td>{{ $user->admin }}</td>
          <td>{{ $user->active }}</td>
        <td>
            <a href="{{ route('impersonate', ['user_id' => $user->id ]) }}" class="btn btn-md btn-default"><i class="fa fa-user-secret" aria-hidden="true"></i> Impersonate this user</a>
        </td>

    </tr>

@empty
    <tr>
        <th colspan="5" class="text-center">No Users yet</th>
    </tr>
@endforelse

// ======== AUTH WITH IMPERSONATION ==========
<ul class="nav navbar-nav">
    <!-- Authentication Links -->
    @if (Auth::guest())
        <li><a href="{{ route('login') }}">Login</a></li>
        <li><a href="{{ route('register') }}">Register</a></li>
    @else
    <li class="dropdown">
        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">
        <img src="{{ url('/profile') . '/' . Auth::user()->profile }}" class="user-image" alt="User Image"> 
            <span class="hidden-xs">{{ Auth::user()->name }} <i class="fa fa-caret-square-o-down" aria-hidden="true"></i></span>
        </a>

        <ul class="dropdown-menu" role="menu">
          @if( session('impersonated_by') )
          <li>
            <a class="dropdown-toggle" href="{{ route('impersonate_leave') }}">
              Back to Admin Account
            </a>
          </li>
          @endif
            <li>
                <a href="{{ route('logout') }}"
                    onclick="event.preventDefault();
                            document.getElementById('logout-form').submit();">
                            <i class="fa fa-sign-out" aria-hidden="true"></i> Logout
                </a>

                <form id="logout-form" action="{{ route('logout') }}" method="POST" style="display: none;">
                    {{ csrf_field() }}
                </form>
            </li>
        </ul>
    </li>
    @endif
</ul>