PHP文件上传类实例详解

PHP文件上传类实例详解

本文实例讲述了PHP文件上传类。分享给大家供大家参考，具体如下：

这里演示了FileUpload.class.php文件上传类，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

具体代码如下：

<?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！');
         }
       }
    }
  }
?>

其中，用到了一个静态工具类 Tool.class.php，代码如下：

Tool.class.php

<?php
  class Tool {
     //弹窗返回
     static public function alertBack($_info) {
       echo "