upload.class.php

<?php 

  /*TIPS：使用此上传图片类须知：
  1、只有会持HTML5标准才允许多文件上传;
  2、如果默认上传文件name值，则为myfile;
  3、如果想多文件上传，那么HTML中的name值请务必设置为数组形式，如：name="myfile[]";
  4、使用本类功能只需要调用uploadFile公共类即可；
  */  
  class upload{
    private $filename;
    private $maxSize;
    private $allowMime;
    private $allowExt;
    private $uploadPath;
    private $imgFlag;
    private $fileInfo;
    private $error;
    private $ext;
    /**
     * [__construct description]
     * @param string  $filename   [description]
     * @param string  $uploadPath [description]
     * @param boolean $imgFlag    [description]
     * @param integer $maxSize    [description]
     * @param array   $allowExt   [description]
     * @param array   $allowMime  [description]
     */
    public function __construct($filename='myfile',$uploadPath='./upload',$imgFlag=true,$maxSize=3145728,$allowExt=array('jpeg','jpg','png','gif'),$allowMime=array('image/jpeg','image/png','image/gif')){
      $this->filename     = $filename;      //表单form里上传文件的name,默认为myfile[]
      $this->maxSize      = $maxSize;       //允许上传大最大值
      $this->allowMime    = $allowMime;     //允许上传的类型
      $this->allowExt     = $allowExt;      //允许上传的后缀名
      $this->uploadPath   = $uploadPath;    //上传文件保存的路径
      $this->imgFlag      = $imgFlag;       //是否设置验证文件真实类型的FLAG
      $this->fileInfo     = array();        //将fileinfo设置为数组，以便保存多个数据
      // $this->fileInfo  = $_FILES[$this->filename];
      
      $this->arraydata();
    }

    private function arraydata(){
        $i=0;
        foreach ($_FILES as $file) {
            if (is_string($file['name'])) {
                $this->fileInfo[$i]=$file;
                $i++;
            }elseif(is_array($file['name'])){
                foreach ($file['name'] as $key => $value) {
                    $this->fileInfo[$i]['name']     = $file['name'][$key];
                    $this->fileInfo[$i]['type']     = $file['type'][$key];
                    $this->fileInfo[$i]['tmp_name'] = $file['tmp_name'][$key];
                    $this->fileInfo[$i]['error']    = $file['error'][$key];
                    $this->fileInfo[$i]['size']     = $file['size'][$key];
                    $i++;
                }
            }
        }
        $this->imgNum=$i;
        // return $fileInfo;
    }

    /**
     * 检测上传文件是否有出错
     * @return bool
     */
    private function checkError($i){
      if(!is_null($this->fileInfo[$i])) {
        if ($this->fileInfo[$i]['error'] > 0) {
          switch ($this->fileInfo[$i]['error']) {
            case 1:
              $this->error = '超过了PHP配置文件中upload_max_filesize选项的值';
              break;
            case 2:
              $this->error = '超过了表单中MAX_FILE_SIZE设置的值';
              break;
            case 3:
              $this->error = '文件部分被上传';
              break;
            case 4:
              $this->error = '没有选择上传文件';
              break;
            case 6:
              $this->error = '没有找到临时目录';
              break;
            case 7:
              $this->error = '文件不可写';
              break;
            case 8:
              $this->error = '由于PHP的扩展程序中断文件上传';
              break;
          }
          return false;
        } else {
          return true;
        }
      }else{
        $this->error='文件上传出错';
        return false;
      }
    }
    /**
     * 检测上传文件的大小
     * @return bool
     */
    private function checkSize($i){
      if($this->fileInfo[$i]['size']>$this->maxSize){
        $this->error='上传文件过大';
        return false;
      }
        return true;
    }
    /**
     * 检测扩展名
     * @return bool
     */
    private function checkExt($i){
      $this->ext=strtolower(pathinfo($this->fileInfo[$i]['name'],PATHINFO_EXTENSION));
      if(!in_array($this->ext,$this->allowExt)){
        $this->error='不允许的扩展名';
        return false;
      }
      return true;
    }
    /**
     * 检测文件类型
     * @return bool
     */
    private function  checkMime($i){
      if(!in_array($this->fileInfo[$i]['type'],$this->allowMime)){
        $this->error='不允许的文件类型';
        return false;
      }
      return true;
    }
    /**
     * 检测是否是真实图片
     * @return bool
     */
    private function checkTrueImg($i){
      if($this->imgFlag){
        if(!@getimagesize($this->fileInfo[$i]['tmp_name'])){
          $this->error='不是真实的图片';
          return false;
        }
        return true;
      }
    }
    /**
     * 检测是否通过http post方式上传的
     * @return bool
     */
    private  function checkHTTPPost($i){
      if(!is_uploaded_file($this->fileInfo[$i]['tmp_name'])){
        $this->error='该文件不是通过http post方式上传的';
        return false;
      }
      return true;
    }
    /**
     * 显示错误
     */
    private function showError(){
      if(!empty($this->errorInfo)){
        foreach ($this->errorInfo as $key => $value) {
          echo $value;//输出错误 可以按照需求改错误提示形式
        }
      }
    }
    /**
     * 检测目录不存在 则创建
     */
    private  function checkUploadPath(){
      if(!file_exists($this->uploadPath)){
        mkdir($this->uploadPath,0777,true);
      }
    }
    /**
     * 产生唯一字符串
     * @return string
     */
    private function getUniName(){
      return md5(uniqid(microtime(true),true));
    }
    /**
     * 上传文件
     *  @return string
     */
    private function toDoUpload($i){
      if($this->checkError($i)&&$this->checkSize($i)&&$this->checkExt($i)&&$this->checkMime($i)&&$this->checkTrueImg($i)&&$this->checkHTTPPost($i)){
        $this->checkUploadPath();
        $this->uniName=$this->getUniName();
        $this->destination=$this->uploadPath.'/'.$this->uniName.'.'.$this->ext;
        if(move_uploaded_file($this->fileInfo[$i]['tmp_name'],$this->destination)){
          return $this->destination;
        }else{
          $this->error='文件移动失败';
        }
      }else{
        $this->errorInfo[$i]="第{$i}个文件：".$this->error."<br>";
      }
    }
    /**
     * 上传文件
     * @return string
     */
    public function uploadFile(){
      for($i=0;$i<$this->imgNum;$i++){
        $this->toDoUpload($i);
      }
      if($i == $this->imgNum){
          echo '文件上传成功';
      }else{
      $this->showError();
      }
    }
  }