PHP文件上传类应用

<?php /***   步骤:*       1.导入inlcude本类文件,如下函数upload 配置存储路径*       2.直接运用，配合前台，运行函数,注意前台form打开enctype*       3.若运行成功，转运文件至指定目录，获得返回值url物理全路径*       4.把指定存储的路径存入数据库*/    /**    *   文件上传函数，把文件保存到指定路径    *   @param     *       $filename:表单里写的文件名称 name="XXX" ，会自动识别$_FILES    *   @return 成功返回图片存储物理全路径，失败返回false    */    function upload($filename){        include_once(__ROOT__.'/common/Upload.class.php');//引入类文件        $path  = __ROOT__."/public/upload/".date("Y-m-d",time());//定义路径        $upload = new upload($filename,$path);//实例化对象        $url  = $upload->uploadFile();//调用成员方法，成功返回保存的物理地址        if(empty($url)){            return false;        }        return $url;    }/**    *   修改会员信息    *   @param $id 哪位会员 $data修改的值[数组形式]    *   @return 成功返回影响行数 ；失败返回false    */    function update_user($id,$data){        $info = get_user($id);//查询出此友情链接的信息        //判断有删除图片操作,清空图片地址        if(@$data['del_pic']){            unlink(__ROOT__.'/public/'.$info['user_img']);            unset($data['del_pic']);            $data['user_img'] = " ";        }        if(!empty($_FILES['user_img']['name'])){            @unlink(__ROOT__."/public/".$info['user_img']);//先删除原来文件exit;            $url = upload('user_img');//移动文件            if($url === false){                return false;            }            $data['user_img'] = strstr($url,"upload");//赋新地址值        }        $user = M('cms_user');        $data['password'] = md6($data['password'] );        $where = " user_id = $id ";        $re = $user->where($where)->data($data)->update();        // echo $link->getLastSql();exit;        if($re){            return true;        }        return false;    }//--------------------------以上为类的应用方法----------------------//------------------------------类开始-----------------------------    class Upload{        protected $fileName;   //文件名称        protected $maxSize;  //文件最大大小        protected $allowMime; //允许的图片范围        protected $allowExt;   //允许的文件后缀名        protected $uploadPath; //设置文件上传路径        protected $imgFlag;        //是否开启检测真实图像        protected $fileInfo;           protected $error;//返回的文件错误        protected $ext; //获取的文件后缀        public function __construct($fileName='myFile',$uploadPath='./uploads',$imgFlag=true,$maxSize=5242880,$allowExt=array('jpeg','jpg','png','gif'),$allowMime=array('image/jpeg','image/png','image/gif')){            $this->fileName=$fileName;            $this->maxSize=$maxSize;            $this->allowMime=$allowMime;            $this->allowExt=$allowExt;            $this->uploadPath=$uploadPath;            $this->imgFlag=$imgFlag;            $this->fileInfo=$_FILES[$this->fileName];        }        /**         * 检测上传文件是否出错         * @return boolean         */        protected function checkError(){            if(!is_null($this->fileInfo)){                if($this->fileInfo['error']>0){                    switch($this->fileInfo['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{                $this->error='文件上传出错';                return false;            }        }        /**         * 检测上传文件的大小         * @return boolean         */        protected function checkSize(){            if($this->fileInfo['size']>$this->maxSize){                $this->error='上传文件过大';                return false;            }            return true;        }        /**         * 检测扩展名s         * @return boolean         */        protected function checkExt(){            $this->ext=strtolower(pathinfo($this->fileInfo['name'],PATHINFO_EXTENSION));            if(!in_array($this->ext,$this->allowExt)){                $this->error='不允许的扩展名';                return false;            }            return true;        }        /**         * 检测文件的类型         * @return boolean         */        protected function checkMime(){            if(!in_array($this->fileInfo['type'],$this->allowMime)){                $this->error='不允许的文件类型';                return false;            }            return true;        }        /**         * 检测是否是真实图片         * @return boolean         */        protected function checkTrueImg(){            if($this->imgFlag){                if(!@getimagesize($this->fileInfo['tmp_name'])){                    $this->error='不是真实图片';                    return false;                }                return true;            }        }        /**         * 检测是否通过HTTP POST方式上传上来的         * @return boolean         */        protected function checkHTTPPost(){            if(!is_uploaded_file($this->fileInfo['tmp_name'])){                $this->error='文件不是通过HTTP POST方式上传上来的';                return false;            }            return true;        }        /**         *显示错误          */        protected function showError(){            exit('<span style="color:red">'.$this->error.'</span>');        }        /**         * 检测目录不存在则创建         */        protected function checkUploadPath(){            if(!file_exists($this->uploadPath)){                mkdir($this->uploadPath,0777,true);            }        }        /**         * 产生唯一字符串         * @return string         */        protected function getUniName(){            return md5(uniqid(microtime(true),true));        }        /**         * 上传文件         * @return string         */        public function uploadFile(){            if($this->checkError()&&$this->checkSize()&&$this->checkExt()&&$this->checkMime()&&$this->checkTrueImg()&&$this->checkHTTPPost()){                $this->checkUploadPath();                $this->uniName=$this->getUniName();                $this->destination=$this->uploadPath.'/'.$this->uniName.'.'.$this->ext;                if(@move_uploaded_file($this->fileInfo['tmp_name'], $this->destination)){                    return  $this->destination;                }else{                    $this->error='文件移动失败';                    $this->showError();                }            }else{                $this->showError();            }        }    }