Tags, but the opposite

Kirby 2 Solved ✅
10

Ok, first one: $this->value() is just a string, so you would have to make that into an array: explode(',', $this->value(). And then compare the two arrays.

As regards also, try site()->index().
As regards also also, panel()->notify() should do the job.

  public function validate() {
     $pages = site()->index()->not($this->page());

      $values = $pages->pluck('intro', ',', true);

      $currentValues = explode(',', $this->value);
      if(empty(array_intersect($currentValues, $values))) {
        return true;
      } else {
        panel()->alert('Oh no, how dare you!');
        panel()->redirect('pages/' . $this->page() . '/edit');
        return false;
      }
    }
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