Carbon_Fields\Field\File_Field::to_json PHP Method

    public function to_json($load)
    {
        $field_data = parent::to_json($load);
        $url = '';
        $thumb_url = '';
        $default_thumb_url = includes_url('/images/media/default.png');
        $file_ext = '';
        $file_name = '';
        $file_type = '';
        $value = $this->get_value();
        if ($value) {
            $url = is_numeric($value) ? wp_get_attachment_url($value) : $value;
            $file_name = basename($url);
            $filetype = wp_check_filetype($url);
            $file_ext = $filetype['ext'];
            // png, mp3, etc..
            $file_type = preg_replace('~\\/.+$~', '', $filetype['type']);
            // image, video, etc..
            if ($file_type == 'image') {
                $thumb_url = $url;
                if ($this->value_type == 'id') {
                    $thumb_src = wp_get_attachment_image_src($value, 'thumbnail');
                    $thumb_url = $thumb_src[0];
                }
            } else {
                $thumb_url = $default_thumb_url;
            }
        }
        $field_data = array_merge($field_data, array('thumb_url' => $thumb_url, 'default_thumb_url' => $default_thumb_url, 'file_ext' => $file_ext, 'file_type' => $file_type, 'file_name' => $file_name, 'button_label' => $this->button_label, 'window_button_label' => $this->window_button_label, 'window_label' => $this->window_label, 'type_filter' => $this->field_type, 'value_type' => $this->value_type));
        return $field_data;
    }