/* *文件名为FileUpload.class.php *将与文件上传相关的成员属性和成员方法声明在一起 */    class FileUpload{            private $filePath;                                  //保存上传文件将被保存的目的路径            private $fileField;                                 //保存从$_FILES[$fileField]中获取上传文件信息            private $originName;                           //保存上传文件的源文件明年            private $tmpFileName;                       //保存上传文件的临时文件名            private $fileType;                                //保存上传文件的类型            private $fileSize;                                  //保存上传文件的大小            private $newFileName;                       //保存上传文件的新文件名            //用于保存上传文件允许的文件类型(保存文件后缀名数组)            private $allowType = array('txt','html','php','js','css','jpg','gif','png','doc','swf','rar','zip');            private $maxSize = 1000000000;          //允许文件上传的最大长度,默认为1MB            private $isUserDefName = false;          //文件上传后，是否采用用户自定文件名            private $userDefName;                         //保存用户自定义的上传文件mingc            private $isRandName = false;              //上传文件是否使用随机文件名称            private $randName;                             //保存系统随机命名的上传文件名称            private $errorNum = 0;                        //保存系统自定义的错误号,默认值为0            private $isCoverModer = true;            //上传文件是否覆盖原有的文件,默认值为TRUE                        /*             * 构造方法，创建上传文件对象时为部分成员属性列表赋初值             * 参数options：提供一个数组,数组下标为成员属性名称,元素值为属性设置的值             */            function __construct($options=array()){                                $this->setOptions($options);                    //调用内容方法为上传文件的属性列表赋值            }                        /*             * 在对象外部调用该法处理上传文件             * 参数filefield提供全局变量数组$_FILES是的第二维数组             * 返回值 如果文件上传成功返回TRUE，如果失败则返回FALSE             */            function uploadFile($filefield){                            $this->setOption('errorNum',0);                    //为错误位设置初值                            $this->setOption('fileField',$filefield);          //通过参数设置成员属性fileField的值                            $this->setFiles();                                             //调用成员方法设置文件信息                            $this->checkValid();                                        //判断上传文件是否有效                            $this->checkFilePath();                                   //检查保存上传文件的路径是否正确                            $this->setNewFileName();                              //将上传文件设置为新文件名                            if($this->errorNum <0)                                   //检查上传文件是否出错                                return $this->errorNum;                            //如果出错退出函数并返回错误号                             return $this->copyFile();                                 //将上传文件移动到指定位置              }                        /*             * 为成员属性列表赋初值             *  参数options：提供一个数组,数组下标为成员属性名称,元素值为属性设置的值             */                        private function setOptions($options = array()){                        foreach($options as $key => $val){//遍历参数数组                            //检查数组的下标是否和成员属性同名                            if(!in_array($key, array('filePath','fileField','originName','allowType','maxSize','isUserDefName','userDefName','isRandName','randName'))){                                continue;//如果数组中没有正确的下标则退出循环                            }                            $this->setOption($key,$val);//将数组中的值赋给对应数组下标的成员属性                        }            }                        /*             * 从$_FILES数组中取值，赋给对应的成员属性             */            private function setFiles(){                if($this->getFileErrorFromFILES()!=0){//检查上传文件是否出现错误                    $this->setOption('errorNum',-1);//如果有错误则设置错误标号为-1                    return $this->errorNum;                //退出函数不向下执行                }                //调用对象内部函数为保存上传文件源名的成员属性赋值                $this->setOption('originName',$this->getFileNameFromFILES());                                //保存上传文件临时文件名的成员属性赋值                $this->setOption('tmpFileName',$this->getTmpFileNameFromFILES());                                //类型                $this->setOption('fileType',$this->getFileTypeFromFILES());                                //大小                $this->setOption('fileSize',$this->getFileSizeFromFILES());                            }                        /*             *为指定的成员属性赋值             *参数key:提供保存成员属性名的变量             *参数val:提供将要为成员属性赋的值             */            private function setOpiton($key,$val){                    $this->$key = $val; //为成员属性赋值            }                        /*             * 为上传文件设置新的文件名称             */            private function setNewFileName(){                //如果不允许随机文件名并且不允许用户自定义文件名，则新文件件名为上传文件源名                if($this->isRandName==false && $this->isUserDefName==false){                    $this->setOption('newFileName', $this->originName);                }elseif($this->isRandName==ture && $this->isUserDefName==false){                    $this->setOption('newFileName',$this->proRandName().'.'.$this->fileType);                }elseif($this->isRandName==false && $this->isUserDefName==true){                    $this->setOption('newFileName',$this->userDefName);                }else{                    $this->setOption('errorNum',-4);//以上条件都不成立 设置错误为-4                }            }                        /*             * 检查上传是否有效             */            private function checkValid(){                $this->checkFileSize();//检查上传文件大小是否超出范围                $this->checkFileType();//检查上传文件类型是否为允许的类型            }                        /*             * 检查上传文件类型是否为允许的类型             */            private function checkFileType(){                if(!in_array($this->fileType, $this->allowType)){                    $this->setOption('errorNum',-2);                        return $this->errorNum;                }            }            /*             * 检查上传文件大小是否超出范围             */            private function checkFileSize(){                if($this->fileSize > $this->maxSize){                    $this->setOption('errorNum',-3);                    return $this->errorNum;                }            }                        /*             * 检查保存上传文件的路径是否有效             */            private function checkFilePath(){               if(!file_exists($this->filePath)){                    if($this->isCoverModer){                            $this->makePath();                    }else{                            $this->setOption('errorNum',-6);                    }                }            }                        /*             * 随机产生上传文件的新文件名称             */            private function  proRandName(){                $tmpStr = 'abcdefghijklmnopqrstuvwxyz0123456789';                $str = "";                $len =strlen($tmpStr);                for($i=0;$i<8;$i++){                    $num = rand(0,$len);                    $str .=$tmpStr[$num];                                    }                return $str;            }                        /*             * 创建保存上传文件的路径             */            private function makePath(){                if(!@mkdir($this->filePath,0755)){                    $this->setOption('errorNum',-7);                }            }                        /*             * 将上传文件从临时目录中复制到指定的新位置             */            private function copyFile(){                $filePath = $this->filePath;                                if($filePath[strlen($filePath)-1] != '/'){                    $filePath .='/';                }                                $filePath .= $this->newFileName;                if(!@move_uploaded_file($this->tmpFileName, $filePath)){                    $this->setOption('errorNum',-5);                }                return $this->errorNum;                            }                        /*             * 从全局变量数组$_FILES中获取上传文件的错误标号             */            private function getFileErrorFromFILES(){                return $this->filedField['error'];            }                        /*             * 获取文件的后缀名             */            private function getFileTypeFromFILES(){                $str =$this->fileField['name'];                $aryStr = split("./", $str);                $ret = strtolower($aryStr[count($aryStr)-1]);                return $ret;            }                        /*             * 从全局变量数组$_FILES中获取上传文件的名称             */            private  function getFileNameFromFILES(){                return $this->fileField['name'];            }                        /*             * 获取临时文件名称             */            private  function getTmpFileNameFromFILES(){                return $this->fileField['tmp_name'];            }                        /*             *获取文件大小             */            private function getFileSizeFromFILES(){                return $this->fileField['size'];            }                        /*             * 根据错误标号返回对应的错误信息             */            public function getErrorMsg(){                $str ="上传文件出错:";                switch ($this->errorNum){                    case -1:                        $str .= "未知错误";                        break;                    case -2:                        $str .= "未允许类型";                        break;                               case -3:                        $str .= "文件过大";                        break;                    case -4:                        $str .= "产生文件名出错";                        break;                    case -5:                        $str .= "上传失败";                        break;                    case -6:                        $str .= "目录不存在";                        break;                    case -7:                        $str .= "建立目录失败";                        break;                }                return $str;            }                     }