PHP+AjaxForm异步带进度条上传文件实例代码

<?php
date_default_timezone_set("PRC"); //设置时间区域
//上传类
class upload{
 protected $file_path = "files"; //当前files存储文件夹
 protected $file_size = 5120000; //5M 用户上传
 /**
 *检测文件是否为空
 */
 public function check_file($get_file)
 {
  if (empty($get_file))
  {
    $type = "check_file";
    $arr = array('error'=>'empty_name','type'=>$type);
    echo json_encode($arr);
    exit();
  }
 return true;
 }
 /**
 *检测文件类型
 */
 public function check_type($get_type)
 {
  if (( $get_type == ".docx" ) || ( $get_type == ".doc" )) {
   //这里只是判断上传word文档可以自己添加
  }else{
   $type = "check_type";
   $arr = array('error'=>'format','type'=>$type);
    echo json_encode($arr);
    exit(); 
  }
 return true;
 }
 /**
 *检测文件大小
 */
 public function check_size($get_file)
 {
  if ( $get_file != "" ) {
   if ( $get_file > $this->file_size ) {
     $arr = array('error'=>'large');
     echo json_encode($arr);
     exit();
   }
 }else{
  return false;
  exit();
 }
 return true;
 }
 /**
 *文件保存
 */
 public function save_file($file_type,$file_tmp_name)
 {
 $rand = rand(1000, 9999);
 $pics =date('YmdHis') . $rand . $file_type;
 $path = $this->file_path."/".$pics;
 $result = move_uploaded_file($file_tmp_name, $path);
 if($result){
  return $pics;
 }else{
  return false;
  exit();
 }
 }
}
?>

<?php
include("upload.class.php");
$up_obj = new upload();
//获取上传文件名
$get_fileName = $_FILES['mypic']['name']; 
$get_fileSize = $_FILES['mypic']['size'];
$get_TmpFiles = $_FILES['mypic']['tmp_name'];
$get_fileType = strstr($get_fileName, '.');
$check_result = $up_obj->check_file($get_fileName);
if($check_result){
 $result_type = $up_obj->check_type($get_fileType);//检查文件类型
 if($result_type){
  $result_size = $up_obj->check_size($get_fileSize);//检查文件大小
  if($result_size){
   $pics = $up_obj->save_file($get_fileType,$get_TmpFiles); //文件上传保存   
   $size = round($get_fileSize/1024,2);
     $arr = array(
      'name' => $get_fileName,
       'pic' => $pics,
       'size'=> $size,
       'error' => 2,
       'list' =>$_POST['list']
     );
    if($pics){ //检查文件上传状态
     echo json_encode($arr);
   }  
  }
 }
}
?>