PHP实现的文件上传类与用法详解

本文实例讲述了PHP实现的文件上传类与用法。分享给大家供大家参考，具体如下：

FileUpload.class.php，其中用到了两个常量，可在网站配置文件中定义：define('ROOT_PATH',dirname(__FILE__)); //网站根目录、define('UPDIR','/uploads/'); //上传主目录

<?php  //上传文件类  class FileUpload {    private $error;  //错误代码    private $maxsize; //表单最大值    private $type;  //类型    private $typeArr = array('image/jpeg','image/pjpeg','image/png','image/x-png','image/gif'); //类型合集    private $path;  //目录路径    private $today;  //今天目录    private $name;  //文件名    private $tmp;  //临时文件    private $linkpath; //链接路径    private $linktotay; //今天目录（相对）    //构造方法，初始化    public function __construct($_file,$_maxsize) {       $this->error = $_FILES[$_file]['error'];       $this->maxsize = $_maxsize / 1024;       $this->type = $_FILES[$_file]['type'];       $this->path = ROOT_PATH.UPDIR;       $this->linktotay = date('Ymd').'/';       $this->today = $this->path.$this->linktotay;       $this->name = $_FILES[$_file]['name'];       $this->tmp = $_FILES[$_file]['tmp_name'];       $this->checkError();       $this->checkType();       $this->checkPath();       $this->moveUpload();    }    //返回路径    public function getPath() {       $_path = $_SERVER["SCRIPT_NAME"];       $_dir = dirname(dirname($_path));       if ($_dir == '//') $_dir = '/';       $this->linkpath = $_dir.$this->linkpath;       return $this->linkpath;    }    //移动文件    private function moveUpload() {       if (is_uploaded_file($this->tmp)) {         if (!move_uploaded_file($this->tmp,$this->setNewName())) {            Tool::alertBack('警告：上传失败！');         }       } else {         Tool::alertBack('警告：临时文件不存在！');       }    }    //设置新文件名    private function setNewName() {       $_nameArr = explode('.',$this->name);       $_postfix = $_nameArr[count($_nameArr)-1];       $_newname = date('YmdHis').mt_rand(100,1000).'.'.$_postfix;       $this->linkpath = UPDIR.$this->linktotay.$_newname;       return $this->today.$_newname;    }    //验证目录    private function checkPath() {       if (!is_dir($this->path) || !is_writeable($this->path)) {         if (!mkdir($this->path)) {            Tool::alertBack('警告：主目录创建失败！');         }       }       if (!is_dir($this->today) || !is_writeable($this->today)) {         if (!mkdir($this->today)) {            Tool::alertBack('警告：子目录创建失败！');         }       }    }    //验证类型    private function checkType() {       if (!in_array($this->type,$this->typeArr)) {         Tool::alertBack('警告：不合法的上传类型！');       }    }    //验证错误    private function checkError() {       if (!empty($this->error)) {         switch ($this->error) {            case 1 :              Tool::alertBack('警告：上传值超过了约定最大值！');              break;            case 2 :              Tool::alertBack('警告：上传值超过了'.$this->maxsize.'KB！');              break;            case 3 :              Tool::alertBack('警告：只有部分文件被上传！');              break;            case 4 :              Tool::alertBack('警告：没有任何文件被上传！');              break;            default:              Tool::alertBack('警告：未知错误！');         }       }    }  }?>