<?php

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abstract class wfDirectoryIterator {

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abstract public function file($file);

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/**

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* @var string

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*/

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private $directory;

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/**

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* @var int

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*/

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private $directory_limit;

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private $directories_entered = array();

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private $directories_processed = array();

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/**

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* @var callback

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*/

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private $callback;

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/**

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* @var int

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*/

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private $max_iterations;

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private $iterations;

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/**

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* @param string $directory

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* @param int $max_files_per_directory

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* @param int $max_iterations

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*/

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public function __construct($directory = ABSPATH, $max_files_per_directory = 20000, $max_iterations = 1000000) {

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$this->directory = $directory;

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$this->directory_limit = $max_files_per_directory;

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$this->max_iterations = $max_iterations;

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}

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public function run() {

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$this->iterations = 0;

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$this->scan($this->directory);

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}

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protected function scan($dir) {

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$dir = rtrim($dir, DIRECTORY_SEPARATOR);

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$handle = opendir($dir);

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$file_count = 0;

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while ($file = readdir($handle)) {

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if ($file == '.' || $file == '..') {

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continue;

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}

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$file_path = $dir . '/' . $file;

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$real_path = realpath($file_path);

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if (isset($this->directories_processed[$real_path]) || isset($this->directories_entered[$real_path])) { //Already processed or being processed, possibly a recursive symlink

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continue;

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}

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else if (is_dir($file_path)) {

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$this->directories_entered[$real_path] = 1;

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if ($this->scan($file_path) === false) {

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closedir($handle);

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return false;

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}

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$this->directories_processed[$real_path] = 1;

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unset($this->directories_entered[$real_path]);

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}

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else {

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if ($this->file($file_path) === false) {

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closedir($handle);

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return false;

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}

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}

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if (++$file_count >= $this->directory_limit) {

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break;

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}

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if (++$this->iterations >= $this->max_iterations) {

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closedir($handle);

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return false;

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}

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}

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closedir($handle);

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return true;

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}

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}

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