文件下载：
html：
<html><body> <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></body></html>
php处理：
<?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);文件上传：
html代码：
<html><body> <form action="doAction5.php" method="post" enctype="multipart/form-data"> 请选择您要上传的文件：<input type="file" name='myFile1' /><br/> 请选择您要上传的文件：<input type="file" name='myFile2' /><br/> 请选择您要上传的文件：<input type="file" name='myFile[]' /><br/> 请选择您要上传的文件：<input type="file" name='myFile[]' /><br/> 请选择您要上传的文件：<input type="file" name='myFile[]' multiple="multiple" /><br/> <input type="submit" value="上传文件" /> </form></body></html>
php代码：
common.func.php
<?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));}upload.func1.php
<?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 $res; }}doAction5.php
<?php //print_r($_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);上面是通过函数实现，下载封装成为类：
html：
<html xmlns="http://www.w3.org/1999/xhtml"><body><form action="doAction6.php" method="post" enctype="multipart/form-data"> 请选择您要上传的文件：<input type="file" name='myFile1' /> <input type="submit" value="上传文件" /></form></body></html>
upload.class.php
<?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([email protected]($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{ $this->showError(); } }}doAction6.php
<?php header('content-type:text/html;charset=utf-8');require_once 'upload.class.php';$upload=new upload('myFile1','imooc');$dest=$upload->uploadFile();echo $dest;