foreach $_FILES

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Hi,

I have a form on my site with many file fields for users to upload files. I 
am trying to verify that for each file uploaded it corresponds with the name 
of the file field i.e.

<tr>
   <td>File_1.CSV:</td>
   <td><input type="file" name="File_1.CSV"></td>
</tr>
<tr>
   <td>File_2.CSV:</td>
   <td><input type="file" name="File_2.CSV"></td>
</tr>

However if I loop through the $_FILES array like this:

foreach( $_FILES as $key => $value ){
   echo '$key = '.$key.'<br />';
   echo '$value = '.$value.'<br />';
}

$key = File_1_CSV
$value['name'] = File_1.CSV
$key = File_2_CSV
$value['name'] = File_2.CSV

The . is replaced with an underscore in the $key value. I could get around 
this with a substr() but it seems a little inelegant, can anyone tell me why 
this is happening please?

Thanks for your advice. 

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