Sessions has() vs exists() vs missing()

Do you know about has, exists and missing methods in Laravel session?

// The has method returns true if the item is present & not null.
$request->session()->has('key');
 
// THe exists method returns true if the item ir present, event if its value is null
$request->session()->exists('key');
 
// THe missing method returns true if the item is not present or if the item is null
$request->session()->missing('key');

Tip given by @iamharis010