php 文件上传代码，限制jpg文件
inputname=$inputname;
            $this->getname(); //取得新的名称
            $this->filesave();
        }
        //随机名称
        private function getname(){
            $this->filename=date(ymdhms).rand(0,9).$this->getproperty();
        }
        //文件属性,返回后辍名
        private function getproperty(){
            if($_files[$this->inputname][type]==image/pjpeg||$_files[$this->inputname][type]==image/jpeg){
                return .jpg;
            }else{
                exit(文件格式不对);
            }
        }
        //文件存储
        private function filesave(){
            if($_files[$this->inputname][size]>$this->filesize){
                exit(文件太大,最大限制为.$this->filesize.字节);
            }
            if(!file_exists($this->filepath)){
                mkdir($this->filepath); //如果文件存储目录不存在,则建立;
            }
            move_uploaded_file($_files[$this->inputname][tmp_name],
                $this->filepath.$this->filename);
        }
    }
    if($_get['action']==filesave){
        $f=new uploadfile(file);
        echo 'filepath.$f->filename.'> 上传成功! filepath.%24f->filename.'>浏览';
    }else{
        echo '
';
    }
?>