Filtering tags if exists in database records.

tagged.php

<?php
/**
* Filter tag if exists
* @param  string $input    Get value from input name
* @return array            All tags is don't exists
*/
private function tagged($input)
{
  $newTags = [];
  $tags = explode(',', $input);
  $getTags = $this->tag->all(['name'])->toArray();

  foreach ($tags as $tag) {
      if(in_array($tag, array_flatten($getTags))) continue;
      $newTags[] = $tag;
  }        

  return $newTags;
}