PHP Decorator Pattern

index.php

<?php

interface FilterNumber {

    /**
     * @return @array
     */
    public function filter();

}

class Results implements FilterNumber {

    protected $data;

    public function __construct($data)
    {
        $this->data = $data;
    }


    public function filter()
    {
        return $this->data;
    }

}

class FilterNumberEvenNumber implements FilterNumber {

    /**
     * @var FilterNumber
     */
    private $filter;

    public function __construct(FilterNumber $filter)
    {
        $this->filter = $filter;
    }


    public function filter()
    {
        return array_filter($this->filter->filter(), function($num) {
            return $num % 2 == 0;
        });
    }
}

class FilterNumberLessThan10 implements FilterNumber {


    /**
     * @var FilterNumber
     */
    private $filter;

    public function __construct(FilterNumber $filter)
    {
        $this->filter = $filter;
    }

    public function filter()
    {
        return array_filter($this->filter->filter(), function($num) {
             return  $num < 10;
        });
    }


}

var_dump((new FilterNumberLessThan10(new FilterNumberEvenNumber(new Results([2,3,4,5,6,7, 234, 23,434,9]))))->filter());