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<?php
class ExArray extends ArrayIterator
{
    public function select($closure)
    {
        $exArray  = new ExArray();
        
        foreach($this->getArrayCopy() as $k => $v)
        {
            if($closure($v,$k))
            {
                $exArray[$k] = $v;
            }
        }
        
        return $exArray;
    }
    
    public function map($closure)
    {
        $exArray  = new ExArray();
        
        foreach($this->getArrayCopy() as $k => $v)
        {
            $elem = $closure($v,$k);
            $exArray[
                is_array($elem) ?
                    array_shift(
                        array_keys(
                            $elem
                        )
                    )
                :
                $k
            ] = array_shift(
                $arrEle = (array)$elem
            );
        }
        
        return $exArray;
    }
}

$eA = new ExArray(
    array(
        0 => 'zero',
        1 => 'one',
        2 => 'two',
        3 => 'three'
    )
);

var_dump(
    $eA->select(
        function($value)
        {
            return preg_match('/^(z|.h)/', $value);
        }
    ),
    $eA->map(
        function($value)
        {
            return $value . " - APPENDED";
        }
    ),
    $eA->map(
        function($value,$key)
        {
            return array(
                $key . " - KEY"
                =>
                $value . " - VALUE"
            );
        }
    )
);