MappedIterator.php

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<?php
class MappedIterator implements Iterator {
        protected $baseIterator;
        protected $vCallback;

    public function __construct( $iter, Closure $vCallback ) {
                if ( is_array( $iter ) ) {
                        $this->baseIterator = new ArrayIterator( $iter );
                } elseif ( $iter instanceof Iterator ) {
                        $this->baseIterator = $iter;
                } else {
                        throw new MWException( "Invalid base iterator provided." );
                }
                $this->vCallback = $vCallback;
    }

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

        public function current() {
                if ( !$this->baseIterator->valid() ) {
                        return null; // out of range
                }
                return call_user_func_array( $this->vCallback, array( $this->baseIterator->current() ) );
        }

        public function key() {
                if ( !$this->baseIterator->valid() ) {
                        return null; // out of range
                }
                return $this->baseIterator->key();
        }

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

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