Create Enumerable Class as Array

enumerable_data.php

<?php
class EnumerableData implements Iterator, Countable
{
    private $position = 0;private $count = 0;
    private $keys = array();
    private $vars = array();

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

    public function current()
    {
        return $this->vars[$this->keys[$this->position]];
    }

    public function key()
    {
        return $this->keys[$this->position];
    }

    public function next()
    {
        $this->position++;
    }

    public function rewind()
    {
        $this->position = 0;
        $reflection = new ReflectionClass(get_class($this));
        $this->vars = $reflection->getConstants();
        $this->keys = array_keys($this->vars);
        $this->count = count($this->vars);
    }

    public function valid()
    {
        return $this->position < count($this->vars);
    }

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

    public function toArray()
    {
        $data = array();
        foreach ($this as $val=>$key) {
            $data[$key] = $val;
        }
        return $data;
    }
}

enumerable_data_class_example.php

<?php
class ProposalTypeEnum extends EnumerableData
{
    const Customize = 1;
    const Regular = 2;
    const Charity = 3;
    const Pemberdayaan = 4;
}