Bolt\Helpers\Arr::replaceRecursive PHP Method

    public static function replaceRecursive(array $array1, array $array2)
    {
        $merged = $array1;
        foreach ($array2 as $key => $value) {
            if (is_array($value) && static::isAssociative($value) && isset($merged[$key]) && is_array($merged[$key])) {
                $merged[$key] = static::replaceRecursive($merged[$key], $value);
            } elseif ($value === null && isset($merged[$key]) && is_array($merged[$key])) {
                continue;
            } else {
                $merged[$key] = $value;
            }
        }
        return $merged;
    }

 /**
  * Insert an individual Contenttype record into the database
  *
  * @param string $filename
  * @param string $contenttypeslug
  * @param array  $values
  *
  * @return boolean
  */
 private function insertRecord($filename, $contenttypeslug, array $values)
 {
     // Determine a/the slug
     $slug = isset($values['slug']) ? $values['slug'] : substr($this->app['slugify']->slugify($values['title']), 0, 127);
     if (!$this->isRecordUnique($contenttypeslug, $slug)) {
         $this->setWarning(true)->setWarningMessage("File '{$filename}' has an exiting ContentType '{$contenttypeslug}' with the slug '{$slug}'! Skipping record.");
         return false;
     }
     // Get a status
     if (isset($values['status'])) {
         $status = $values['status'];
     } else {
         $status = $this->contenttypes[$contenttypeslug]['default_status'];
     }
     // Transform the 'publish' action to a 'published' status
     $status = $status === 'publish' ? 'published' : $status;
     // Insist on a title field
     if (!isset($values['title'])) {
         $this->setWarning(true)->setWarningMessage("File '{$filename}' has a '{$contenttypeslug}' with a missing title field! Skipping record.");
         return false;
     }
     // Set up default meta
     $meta = ['slug' => $slug, 'datecreated' => date('Y-m-d H:i:s'), 'datepublish' => $status == 'published' ? date('Y-m-d H:i:s') : null, 'ownerid' => 1];
     $values = Arr::replaceRecursive($values, $meta);
     $record = $this->app['storage']->getEmptyContent($contenttypeslug);
     $record->setValues($values);
     if ($this->app['storage']->saveContent($record) === false) {
         $this->setWarning(true)->setWarningMessage("Failed to imported record with title: {$values['title']} from '{$filename}'! Skipping record.");
         return false;
     } else {
         $this->setNotice(true)->setNoticeMessage("Imported record with title: {$values['title']}.");
         return true;
     }
 }