isset和！empty没有通过检查上传的文件 [英] isset and !empty not passing through a check for uploaded files

问题描述

我有一个上传表单，上传一个文件。我的问题是即使没有文件上传if（isset（$ _ FILES））或者if（！empty（$ _ FILES））仍然成功通过：

  $ _ FILES = $ HTTP_POST_FILES; 
 if（$ _ POST ['type'] =='photo'&& isset（$ _ FILES））{
 //即使没有上传文件也会返回true。我错过了什么！ 
 
 $ / code $ / $ p 
 
解决方案
无论上传的文件是否存在，c $ c> $ _ FILES 大概总是被设置。
 
 
检查文件上传你会期望，看看大小字段。 （显然根据手册中的User Contributed Notes，如果表单包含upload元素，甚至可能会返回 isset（$ _ FILES [my_file_name]）即使没有选择文件也是如此。
 
 
 
这应该可靠： 
 
 
 <$ c $（$ _ POST ['type'] =='photo'&& 
（（isset（$ _ FILES [my_file_name] [size]）&& 
 （$ _FILES [my_file_name] [size]> 0）））{
  
 isset（）是为了防止未定义的索引的通知。）
 
 
 
顺便说一下，你做了什么？：
  $ _ FILES = $ HTTP_POST_FILES; 
  
 
I have an upload form with a file to be uploaded. The issue I have is that even when no file is uploaded the if(isset($_FILES)) OR if(!empty($_FILES)) still passes as successful:
$_FILES = $HTTP_POST_FILES;
if($_POST['type'] == 'photo' && isset($_FILES)){
// returns true even if no file is uploaded. What am I missing!
}

解决方案
Being a superglobal, $_FILES is presumably always set, regardless whether an uploaded file exists or not.

Check for the file upload(s) you would expect and look at the size field. (Apparently according to the User Contributed Notes in the manual, if the form contains the upload element, it is possible that even isset($_FILES["my_file_name"]) will return true even though there was no file selected.

This should work reliably:
if($_POST['type'] == 'photo' && 
   ((isset($_FILES["my_file_name"]["size"]) && 
    ($_FILES["my_file_name"]["size"] > 0)) ){
(the isset() is to prevent a "undefined index" notice.)

What do you do this for, by the way?:
$_FILES = $HTTP_POST_FILES;


                        
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