FilterIterator dummy example

FilterIteratorExample.php

<?php
class FilterExample extends FilterIterator
{
    protected $number_type;

    public function __construct($iterator, $number_type)
    {
        parent::__construct($iterator);
        $this->number_type = $number_type;
    }

    public function accept()
    {
        switch ($this->number_type)
        {
            case 'even':
                return ! ($this->current() % 2);
                break;
            case 'odd':
                return ($this->current() % 2);
            default:
                return false;
                break;
        }
        return false;
    }
}

$numbers  = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
$filtered = new FilterExample(new ArrayIterator($numbers), 'even');
foreach ($filtered as $variable => $value)
{
    echo $value.'<br/>';
}