php 文件上传类

<?php
/**
 * 文件上传类
 * 2011/9/22
 * kcj
 * */
class UpFile{
	private  $filePath;                             //文件目的路径
	private  $fileField;                            //默认$_FILES[$fileField],通过$_FILES环境变量获取上传文件信息
	private  $originName;                           //源文件名
	private  $tmpFileName;                          //临时文件名
	private  $fileType;                             //文件类型
	private  $fileSize;                             //文件大小
	private  $newFileName;                          //新文件名
	private  $allowType=array('jpg','gif','png');   //
	private  $maxSize=2000000;                      //允许文件上传的最大度是2M
	private  $isUserDefName=false;                  //是否采用用户自定义名
	private  $userDefName;                          //用户定义名称
	private  $isRandName=true;                      //是否随机命名
	private  $randName;                             //系统随机名称
	private  $errorNum=0;                           //错误号
	private  $isCoverModer=true;                    //是否覆盖模式
	
	function  __construct($options=array()){
		$this->setOptions($options);        //设置上传时属性列表
	}
	
	function uploadFile($filefield){
		$this->setOption('errorNum',0);                //设置错误位
		$this->setOption('fileField',$filefield);      //设置fileField
		$this->setFiles();                             //设置文件信息
		$this->checkValid();                           //判断合法性
		$this->checkFilePath();                        //检查文件路径
		$this->setNewFileName();                       //设置新的文件名
		if($this->errorNum<0)
		return $this->errorNum;
	 return  $this->copyFile();  //上传文件
	}
	private  function setOptions($options=array()){
		foreach ($options as $key=>$val){
			if(!in_array($key,array('filePath','fileField','originName','allowType','maxSize','isUserDefName','userDefName','isRandName','randName'))) 
			continue;
			$this->setOption($key,$val);
		}
	}
	private function setFiles(){
		if($this->getFileErrorFromFILES!=0){
			$this->setOptions('errorNum',-1);
			return $this->errorNum;
		}
		$this->setOption('originName',$this->getFileNameFromFILES());
		$this->setOption('tmpFileName',$this->getTmpFileNameFromFILES());
		$this->setOption('fileType',$this->getFileTypeFromFILES());
		$this->setOption('fileSize',$this->getFileSizeFromFILES());
	
	}
	private function setOption($key,$val){
		$this->$key=$val;
	}
	private  function setNewFileName(){
		if($this->isRandName==false&&$this->isUserDefName==false){
			$this->setOption('newFileName',$this->originName);
		}elseif ($this->isRandName==true&&$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);
		}
	}
	private function checkValid(){
		$this->checkFileSize();
		$this->checkFileType();
	}
	private function checkFileType(){
		if(!in_array($this->fileType,$this->allowType)){
			$this->setOption('errorNum',-2);
		}else {
			return $this->errorNum;
		}
	}
	private  function checkFileSize(){
		if($this->fileSize>$this->maxSize){
			$this->setOption('errorNum',-3);
		}else {
			return $this->errorNum;
		}
	}
	private  function checkFilePath(){
		if(!file_exists($this->filePath)){
			if($this->isCoverModer){
				$this->makePath();
			}else {
				$this->setOption('errorNum',-6);
			}
		}
	}
	private function proRandName(){
		$tmpStr= "abcdefghijklmnopqrstuvwxyz0123456789";
		$str="";
		for ($i=0;$i<8;$i++){
			$num=rand(0,strlen($tmpStr));
			$str.=$tmpStr[$num];
		}
		return $str;
	}
	private function makePath(){
		if(!@mkdir($this->filePath,0755)){
			$this->setOption('errorNum',-7);
		}
	}
	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;
	}
	function getNewFileName(){
	   return 	$this->newFileName;
	}
	private function getFileErrorFromFILES(){
		return  $this->fileField['error'];
	}
	private function getFileTypeFromFILES(){
		$str=$this->fileField['name'];
		$aryStr=split("\.",$str);                //将字符串分割到数组中
		$ret=strtolower($aryStr[count($aryStr)-1]);
		return  $ret;
	}
	private function getFileNameFromFILES(){
		return $this->fileField['name'];
	}
	private function getTmpFileNameFromFILES(){
		return $this->fileField['tmp_name'];
	}
	private function getFileSizeFromFILES(){
		return $this->fileField['size'];
	}
	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;
	}
}

?>