<?php
$tags = Input::get('tag');
$tags = explode(",", $tags);
foreach($tags as $key => $tag):
$tag->slug = $tag;
if($tag->save()):
$tagId = $tag->id;
$listag = new ListTag;
$listag->list_id = $listId;
$listag->tag_id = $tagId;
$listag->save();
endif;
endforeach;