PicoFeed\Filter\Attribute::filter PHP Méthode

    public function filter($tag, array $attributes)
    {
        foreach ($attributes as $attribute => &$value) {
            foreach ($this->filters as $filter) {
                if (!$this->{$filter}($tag, $attribute, $value)) {
                    unset($attributes[$attribute]);
                    break;
                }
            }
        }
        return $attributes;
    }

 /**
  * Parse opening tag.
  *
  * @param resource $parser     XML parser
  * @param string   $tag        Tag name
  * @param array    $attributes Tag attributes
  */
 public function startTag($parser, $tag, array $attributes)
 {
     $this->empty = true;
     if ($this->tag->isAllowed($tag, $attributes)) {
         $attributes = $this->attribute->filter($tag, $attributes);
         if ($this->attribute->hasRequiredAttributes($tag, $attributes)) {
             $attributes = $this->attribute->addAttributes($tag, $attributes);
             $this->output .= $this->tag->openHtmlTag($tag, $this->attribute->toHtml($attributes));
             $this->empty = false;
         }
     }
     $this->empty_tags[] = $this->empty;
 }