This article mainly introduces examples of file upload and download in PHP. This article explains in detail and comprehensively the demand analysis and function implementation related to file upload, and also provides the usage code. Friends who need it can refer to it. PHP implements file upload and download
1. Upload principle and configuration
1.1 Principle
Upload client files to the server. Then move the server-side files (temporary files) to the specified directory.
1.2 Client configuration
Required: form page (select upload file);
Specifically: the sending method is POST, add enctype="multipart/form- data" attribute, both are indispensable (however, both advantages and disadvantages coexist, and the upload method and subsequent calling of the uploaded file are also limited here, which will be discussed later)
The first is the form page (please ignore the front-end issues automatically...), the key is the attribute of form; the other is the use of type="file" in input (reflecting the power of PHP expansion, etc.).
Then doAction
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Array ( [myFile] => Array ( [name] => 梁博_简历.doc [type] => application/msword [tmp_name] => D:\wamp\tmp\php1D78.tmp [error] => 0 [size] => 75776 ) )
--The reason for the error reporting:
Basically They all exceed or do not comply with the server's configuration for uploading files. So what are the server-side configurations? First consider uploading what we used? POST, uploadSo look for these items in php.ini:file_upload:Onupload_tmp_dir=——Temporary file saving directory; upload_max_filesize=2Mmax_file_uploads=20——The maximum number of files allowed to be uploaded at one time (note the difference from the above one, don’t think about it if there is a size)post_max_size=8M——post method Maximum value of sent dataOther related configuration
max_exectuion_time=-1——Maximum execution time to avoid the program from occupying server resources; max_input_time=60max_input_nesting_level=64——Input nesting depth;memory_limit=128M——Maximum independent memory usage of a single threadIn short, it is all about resources configuration.--Error number
The following (lazy) is quoted from http://blog.sina.com.cn/s/blog_3cdfaea201008utf.html2. Upload related restrictions
2.1 Client restrictions$maxsize) { exit("上传文件过大!"); } if (!in_array($ext, $allowExt)) { exit("非法文件类型"); } if (!is_uploaded_file($tmp_name)) { exit("上传方式有误,请使用post方式"); } if (@move_uploaded_file($tmp_name, $uniName)) {//@错误抑制符,不让用户看到警告 echo "文件".$filename."上传成功!"; }else{ echo "文件".$filename."上传失败!"; } //判断是否为真实图片(防止伪装成图片的病毒一类的 if (!getimagesize($tmp_name)) {//getimagesize真实返回数组,否则返回false exit("不是真正的图片类型"); } }else{ switch ($error){ case 1: echo "超过了上传文件的最大值,请上传2M以下文件"; break; case 2: echo "上传文件过多,请一次上传20个及以下文件!"; break; case 3: echo "文件并未完全上传,请再次尝试!"; break; case 4: echo "未选择上传文件!"; break; case 7: echo "没有临时文件夹"; break; } } 这里,具体实现都有注释,每一步其实都可以自己
$maxSize) { exit("上传文件过大!"); } if (!in_array($ext, $allowExt)) { exit("非法文件类型"); } if (!is_uploaded_file($tmp_name)) { exit("上传方式有误,请使用post方式"); } //判断是否为真实图片(防止伪装成图片的病毒一类的 if (!getimagesize($tmp_name)) {//getimagesize真实返回数组,否则返回false exit("不是真正的图片类型"); } if (@move_uploaded_file($tmp_name, $destination)) {//@错误抑制符,不让用户看到警告 echo "文件".$filename."上传成功!"; }else{ echo "文件".$filename."上传失败!"; } }else{ switch ($error){ case 1: echo "超过了上传文件的最大值,请上传2M以下文件"; break; case 2: echo "上传文件过多,请一次上传20个及以下文件!"; break; case 3: echo "文件并未完全上传,请再次尝试!"; break; case 4: echo "未选择上传文件!"; break; case 7: echo "没有临时文件夹"; break; } } return $destination; }
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3. Implementation of uploading multiple files
3.1 Use single file encapsulationfunction uploadFile($fileInfo,$path="uploads",$allowExt=array('jpeg','jpg','png','tif'),$maxSize=10485760){
Array ( [myFile] => Array ( [name] => Array ( [0] => test32.png [1] => test32.png [2] => 333.png [3] => test41.png ) [type] => Array ( [0] => image/png [1] => image/png [2] => image/png [3] => image/png ) [tmp_name] => Array ( [0] => D:\wamp\tmp\php831C.tmp [1] => D:\wamp\tmp\php834C.tmp [2] => D:\wamp\tmp\php837C.tmp [3] => D:\wamp\tmp\php83BB.tmp ) [error] => Array ( [0] => 0 [1] => 0 [2] => 0 [3] => 0 ) [size] => Array ( [0] => 46174 [1] => 46174 [2] => 34196 [3] => 38514 ) ) )
可以得到一个三维数组。
复杂是复杂了,但复杂的有规律,各项数值都在一起了,很方便我们取值!!
所以先得到文件信息,变成单文件处理那种信息
function getFiles(){ $i=0; foreach($_FILES as $file){ if(is_string($file['name'])){ //单文件判定 $files[$i]=$file; $i++; }elseif(is_array($file['name'])){ foreach($file['name'] as $key=>$val){ //我的天,这个$key用的diao $files[$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 $files; }
然后之前的那种exit错误,就把exit改一下就好了,这里用res
function uploadFile($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 $res=array(); if($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 $res; } }
里面封装了两个小的
function getExt($filename){ return strtolower(pathinfo($filename,PATHINFO_EXTENSION)); } /** * 产生唯一字符串 * @return string */ function getUniName(){ return md5(uniqid(microtime(true),true)); }
然后静态中,用multiple属性实现多个文件的输入;
doAction6 '; $uploadFiles[]=@$res['dest']; } $uploadFiles=array_values(array_filter($uploadFiles)); //print_r($uploadFiles);Insert title here
这样子的几个文件,就实现比较强大的面向过程的上传文件的功能(学的叫一个心酸。。。);
四、面向对象的文件上传
fileName=$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'])){
$this->error='文件不是通过HTTP POST方式上传上来的';
return false;
}
return true;
}
/**
*显示错误
*/
protected function showError(){
exit(''.$this->error.'');
}
/**
* 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();
}
}
}
uploadFile();
echo $dest;
四、下载
对于浏览器不识别的,可以直接下载,但对于能识别的,需要多一两步
Insert title here 下载1.rar
下载1.jpg
通过程序下载1.jpg
下载nv.jpgCopy after login
总结:以上就是本篇文的全部内容,希望能对大家的学习有所帮助。
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