php实现文件下载和多文件上传

    <a href="1.rar">下载1.rar</a>    <br>    <a href="1.jpg">下载1.jpg</a> <!--会显示文件内容，而不是下载-->    <br>    <a href="doDownload.php?filename=1.jpg">通过程序下载1.jpg</a>    <br>    <a href="doDownload.php?filename=../upload/nv.jpg">下载nv.jpg</a>

<?php $filename=$_GET['filename'];//设置下载文件名header('content-disposition:attachment;filename='.basename($filename));header('content-length:'.filesize($filename));readfile($filename);

<?php /** * 得到文件扩展名 * @param string $filename * @return string */function getExt($filename){	return strtolower(pathinfo($filename,PATHINFO_EXTENSION));}/** * 产生唯一字符串 * @return string */function getUniName(){	return md5(uniqid(microtime(true),true));}

<?php /** * 构建上传文件信息 * @return unknown */function getFiles(){	$i=0;	foreach($_FILES as $file){		if(is_string($file['name'])){			$files[$i]=$file;			$i++;		}elseif(is_array($file['name'])){			foreach($file['name'] as $key=>$val){				$files[$i]['name']=$file['name'][$key];				$files[$i]['type']=$file['type'][$key];				$files[$i]['tmp_name']=$file['tmp_name'][$key];				$files[$i]['error']=$file['error'][$key];				$files[$i]['size']=$file['size'][$key];				$i++;			}		}	}	return $files;	}/** * 针对于单文件、多个单文件、多文件的上传 * @param array $fileInfo * @param string $path * @param string $flag * @param number $maxSize * @param array $allowExt * @return string */function uploadFile($fileInfo,$path='./uploads',$flag=true,$maxSize=1048576,$allowExt=array('jpeg','jpg','png','gif')){	//$flag=true;	//$allowExt=array('jpeg','jpg','gif','png');	//$maxSize=1048576;//1M	//判断错误号	if($fileInfo['error']===UPLOAD_ERR_OK){		//检测上传得到小		if($fileInfo['size']>$maxSize){			$res['mes']=$fileInfo['name'].'上传文件过大';		}		$ext=getExt($fileInfo['name']);		//检测上传文件的文件类型		if(!in_array($ext,$allowExt)){			$res['mes']=$fileInfo['name'].'非法文件类型';		}		//检测是否是真实的图片类型		if($flag){			if(!getimagesize($fileInfo['tmp_name'])){				$res['mes']=$fileInfo['name'].'不是真实图片类型';			}		}		//检测文件是否是通过HTTP POST上传上来的		if(!is_uploaded_file($fileInfo['tmp_name'])){			$res['mes']=$fileInfo['name'].'文件不是通过HTTP POST方式上传上来的';		}		if($res) return $res;		//$path='./uploads';		if(!file_exists($path)){			mkdir($path,0777,true);			chmod($path,0777);		}		$uniName=getUniName();		$destination=$path.'/'.$uniName.'.'.$ext;		if(!move_uploaded_file($fileInfo['tmp_name'],$destination)){			$res['mes']=$fileInfo['name'].'文件移动失败';		}		$res['mes']=$fileInfo['name'].'上传成功';		$res['dest']=$destination;		return $res;			}else{		//匹配错误信息		switch ($fileInfo ['error']) {			case 1 :				$res['mes'] = '上传文件超过了PHP配置文件中upload_max_filesize选项的值';				break;			case 2 :				$res['mes'] = '超过了表单MAX_FILE_SIZE限制的大小';				break;			case 3 :				$res['mes'] = '文件部分被上传';				break;			case 4 :				$res['mes'] = '没有选择上传文件';				break;			case 6 :				$res['mes'] = '没有找到临时目录';				break;			case 7 :			case 8 :				$res['mes'] = '系统错误';				break;		}		return $res;	}}

<?php //print_r($_FILES);header("content-type:text/html;charset=utf-8");require_once 'upload.func1.php';require_once 'common.func.php';$files=getFiles();// print_r($files);foreach($files as $fileInfo){	$res=uploadFile($fileInfo);	echo $res['mes'],'<br/>';	$uploadFiles[]=$res['dest'];}$uploadFiles=array_values(array_filter($uploadFiles));print_r($uploadFiles);

<?php class upload{	protected $fileName;	protected $maxSize;	protected $allowMime;	protected $allowExt;	protected $uploadPath;	protected $imgFlag;	protected $fileInfo;	protected $error;	protected $ext;	/**	 * @param string $fileName	 * @param string $uploadPath	 * @param string $imgFlag	 * @param number $maxSize	 * @param array $allowExt	 * @param array $allowMime	 */	public function __construct($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	 * @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();		}	}}

<?php header('content-type:text/html;charset=utf-8');require_once 'upload.class.php';$upload=new upload('myFile1','imooc');$dest=$upload->uploadFile();echo $dest;