Assign array index for multiple files

[Anon]

Hi,

I have a question for uploading multiple files.

<form action=\"file-upload.php\" method=\"post\" enctype=\"multipart/form-data\">
Send these files:<br>
<input name=\"userfile[]\" type=\"file\"><br>
<input name=\"userfile[]\" type=\"file\"><br>
<input type=\"submit\" value=\"Send files\">
</form>

I use above method. However, I want to assign the array number myself it is not successful. e.g. userfile[0],userfile[1].

Any method I could assign particular array for particular file ? userfile[0] could be null

Thx