Attachments added through JavaScript function are not sent - php

Question

I am using the following loop to send/attach multiple attachments to my email message.
foreach(array_keys($_FILES['attachment']['name']) as $key) {
$source = $_FILES['attachment']['tmp_name'][$key];
$filename = $_FILES['attachment']['name'][$key]; // original filename from the client
$mail->AddAttachment($source, $filename);
}
But only the first attachment i made is sended.
The form code is
<form method="POST" action="<?php $PHP_SELF ?>" enctype="multipart/form-data">
<input type="file" name="attachment[]" id="attachment" size="30"
onchange="document.getElementById('moreUploadsLink').style.display = 'block';" />
<div id="moreUploads"></div>
<div id="moreUploadsLink" style="display:none;">
Attach another File</div>
<input name="submit" type="submit" value="submit" />
</form>
When one click on Attach another file, another File Upload button is shown, through a JavaScript function:
<script type="text/javascript">
var upload_number = 1;
var attachmentlimit = 5;
function addFileInput() {
var d = document.createElement("div");
var file = document.createElement("input");
file.setAttribute("type", "file");
file.setAttribute("name", "attachment"+upload_number);
d.appendChild(file);
document.getElementById("moreUploads").appendChild(d);
upload_number++;
if(upload_number == attachmentlimit) {
document.getElementById('moreUploadsLink').style.display='none';
}
}
</script>
Only the file attached through the first FileUpload Button is attached and sended, not the others.
Help.

Answer 1

The problem is that you are setting the name attribute of your new input element to attachment1, attachment2, etc. You should be setting this name to attachment[], just like the original input you created.
If you still don't get all your attachments, you can try a var_dump($_FILES) in your PHP script to ensure that you are getting all the files the way you expect them.