php 文件操作类

<?php/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. *//** * Description of File * 文件操作类 *  * @author admin */class File {    //拷贝文件    public function copy_file($file, $copy_file) {        if (file_exists($file) && file_exists($copy_file)) {            return copy($file, $copy_file);        } else {            return false;        }    }        //删除文件    public function delete_file($filename) {        if (file_exists($filename)) {            return unlink($filename);        } else {            return false;        }    }    //重命名文件    public function rename_file($oldfilename, $newfilename) {        if (file_exists($oldfilename) && file_exist($newfilename)) {            return rename($oldfilename, $newfilename);        } else {            return false;        }    }    //复制文件夹    public function copy_dir($olddir, $newdir) {        if (!is_dir($olddir)) {            throw new Exception("$oldir目录不存在");            return;        }        if (!is_dir($newdir)) {            mkdir($newdir);        }        $hand = opendir($olddir);        while ($file = readdir($hand)) {            if (is_dir("$olddir/$file")) {                if ($file != '.' && $file != '..') {                    $this->copy_dir($olddir . "/$file", $newdir . "/$file");                }            } else {                $this->copy_file($olddir . "/$file", $newdir . "/$file");            }        }    }    //删除文件夹    public function delete_dir($dirname) {        $hand = opendir($dirname);        while ($file = readdir($hand)) {            if  ($file != '.' && $file != '..') {                 if(is_dir("$dirname/$file")){                     $this->delete_dir("$dirname/$file");                 }else{                     $this->delete_file("$dirname/$file");                 }        }        rmdir($dirname);      }    }}$file = new File();//$file->copy_dir("../01", "./04_copy");//$file->delect_file('index_new.php');//$file->delete_dir('./02_copy');$file->rmdirs('./03_copy');