PhutilCallbackFilterIterator.php
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	<?php

	/**
	* NOTE: This class has the same purpose as CallbackFilterIterator in PHP 5.4.
	*/
	final class PhutilCallbackFilterIterator extends FilterIterator {
	private $callback;

	/**
	* @param Iterator
	* @param callable Signature: (mixed $current): bool.
	*/
	public function __construct(Iterator $iterator, $callback) {
	parent::__construct($iterator);
	if (!is_callable($callback)) {
	throw new Exception('Callback must be callable.');
	}
	$this->callback = $callback;
	}

	public function accept() {
	return call_user_func($this->callback, $this->current());
	}

	}