1、
check.php页面：


//图片上传到服务器

function fileext($filename)
  {
    return substr(strrchr($filename,'.'),1);  //获取扩展名
    
  }
function random($length)
  {  //生成随机文件名函数
    $hash='CR-';
    $chars='abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz';
    $max=strlen($chars)-1;
    mt_srand((double)microtime()*1000000);
      for($i=0;$i<$length;$i++)
       {
        $hash.=$chars(mt_rand(0,$max));
       }
       return $hash;
  }

?>

form.php页面：

      
          
              
              
          
          
              
          
      

文件：

upload.php页面：
  
   include("check.php");
   $uploaddir="./files?";
   $type=array("jpg","gif","bmp","jpeg","pan");//设置允许上传文件的类型
   if(!in_array(strtolower(fileext($_FILES['file']['name'])),$type))//判断上传文件的类型是否在范围内
     {
        $text=implode(",",$type);
        echo "您只能上传以下类型文件：",$text,"
";
     }else
       {
        $filename=explode(".",$_FILES['file']['name']);//获取文件名
        do{
            $filename[0]=random(10);
            $name=implode(".",$filename);
            $uploadfile=$upload.$name;
          }
        while(file_exists($uploadfile));
          if(is_uploaded_file($_FILES['file']['tmp_name']))
            {
                if(move_uploaded_file($_FILES['file']['tmp_name'],$uploadfile))
                 {
                    echo "您的文件已经上传完毕 上传图片预览：
                    echo "
继续上传";
                 }else
                   {
                    echo "上传失败";
                   }
            }
       }
?>


2、