ArjanSchouten / HtmlMinifier

     *

     * @return \ArjanSchouten\HtmlMinifier\Placeholders\PlaceholderInterface[]

     */

    public function addPlaceholder($placeholder)

    {

        if (!isset(class_implements($placeholder)[PlaceholderInterface::class])) {

            throw new InvalidArgumentException('The class ['.$placeholder.'] should be a member of the ['.PlaceholderInterface::class.']');

        } elseif (in_array($placeholder, $this->placeholders)) {

            throw new InvalidArgumentException('The placeholder ['.$placeholder.'] is already added to the minifier!');

        }

        $this->placeholders[] = $placeholder;

        return $this->placeholders;

    }

    /**

     * @return \ArjanSchouten\HtmlMinifier\Minifiers\MinifierInterface[]

     *

     * @return \ArjanSchouten\HtmlMinifier\Minifiers\MinifierInterface[]

     */

    public function addMinifier($minifier)

    {

        if (!isset(class_implements($minifier)[MinifierInterface::class])) {

            throw new InvalidArgumentException('The class ['.$minifier.'] should be a member of the ['.MinifierInterface::class.']');

        } elseif (in_array($minifier, $this->minifiers)) {

            throw new InvalidArgumentException('The minifier ['.$minifier.'] is already added to the minifier!');

        }

        $this->minifiers[] = $minifier;

        return $this->minifiers;

    }

    /**

     * Get the classname without the namespace.