<?php namespace Guzzle\Iterator; use Guzzle\Common\Exception\InvalidArgumentException; /** * Maps values before yielding */ class MapIterator extends \IteratorIterator { /** @var mixed Callback */ protected $callback; /** * @param \Traversable $iterator Traversable iterator * @param array|\Closure $callback Callback used for iterating * * @throws InvalidArgumentException if the callback if not callable */ public function __construct(\Traversable $iterator, $callback) { parent::__construct($iterator); if (!is_callable($callback)) { throw new InvalidArgumentException('The callback must be callable'); } $this->callback = $callback; } public function current() { return call_user_func($this->callback, parent::current()); } }