PHP

laravel redirect back

return Redirect::back()->withErrors(['msg', 'The Message']);

and inside your view call this

@if($errors->any())
<h4>{{$errors->first()}}</h4>
@endif

laravel redirect back with input

// Laravel 5
return redirect()->back()->withInput();
// Laravel 6,7, 8
return back()->withInput();

laravel redirect back

return back();

return redirect()->back();

return redirect()->previous();

redirect back with input laravel in request

// class ExampleRequest 
public function response(array $errors): RedirectResponse
{
  return Redirect::back()->withErrors($errors)->withInput();
}

laravel redirect back with errors and input

return redirect()->back()->withInput();