PhutilCallbackFilterIterator.php
9f4c28f6b82eproduction

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());
			}

			}