<form action="{:U('Upload/index')}" enctype="multipart/form-data" method="post" >  <p><input type="file" id="file3" name="ID[]" /></p>  <p><input type="file" id="file4" name="ID[]" /></p>  <input type="submit" value="上傳" />  <p><img id="img1" </form>

public function index(){       if(!empty($_FILES)){        $upload = new /Think/Upload();// 實例化上傳類        $upload->maxSize = 3145728;        $upload->rootPath = './Uploads/';        $upload->savePath = 'image/';        //$upload->saveName = date('YmdHis').'-'.randomkeys(3);//msectime(),毫秒數13位        $upload->saveName = 'msectime';   //自定義函數，采用13位毫秒和3位隨機數        $upload->exts   = array('jpg', 'gif', 'png', 'jpeg');        $upload->autoSub = true;        $upload->subName = array('date','Ymd');                /* 判斷$_FILES[$key]是否：一維數組，單張圖片上傳 -xzz0703          * 原理：html的input type = "file" name="IDcard"和name="IDcard[]"的區別：         *    $_FILES前者到后臺php是二維數組，后者是三維數組         */        foreach($_FILES as $key=>$value){          if(count($_FILES[$key]) == count($_FILES[$key],1)){            $info = $upload->uploadOne($_FILES[$key]);            if($info){              echo json_encode(array('code'=>200,'id'=>$img_id,'name'=>$img_name));exit;            }else{              echo json_encode(array('code'=>0,'msg'=>$upload->getError()));exit;            }          }        }        if(count($_FILES)){          $info = $upload->upload();//如果是二維數組，使用批量上傳文件的方法          if(!$info){            $this->error($upload->getError());            exit;          }          $img_url = '/Uploads/'.$info[0]['savepath'].$info[0]['savename'];          $res = array('imgPath1'=>$img_url,code=>$img_url,'msg'=>$info);          echo json_encode($res);        }              }   }

//返回當前的毫秒時間戳和隨機數合并的字符串function msectime() {  list($msec, $sec) = explode(' ', microtime());  $msectime = (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000).randomkeys(3);  return $msectime;}