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cant get rename file on upload to work

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Hi,
im trying to rename files that are uploaded by a form.The filename should contain the value of two fields separated by "-".

This is my code:

function rename_file($filename, $filename_raw) {
if ($_POST['form_id'] == '3') {
$id = $_POST['item_meta[11]'] . '-';
$name = $_POST['item_meta[12]'];
$info = pathinfo($filename);
$ext = empty($info['extension']) ? '' : '.' . $info['extension'];
$new = "test" . $id . $name . $ext;
if( $new != $filename_raw ) {
$new = sanitize_file_name( $new );
}
return $new;
} else {
return $filename;
}
}
add_filter('sanitize_file_name', 'rename_file', 10, 2);

When uploading a file the name is changed to Example:"-.mp4".
I can't find the issue. According to other forum posts the code should work

EDIT:

<?php

function rename_file($filename, $filename_raw) {
if ($_POST['form_id'] == '3') {
$id = $_POST['item_meta'][11] . '-';
$name = $_POST['item_meta'][12];
$info = pathinfo($filename);
$ext = empty($info['extension']) ? '' : '.' . $info['extension'];
$new = "test" . $id . $name . $ext;
if( $new != $filename_raw ) {
$new = sanitize_file_name( $new );
}
return $new;
} else {
return $filename;
}
}
add_filter('sanitize_file_name', 'rename_file', 10, 2);

I have seen: as of the release of Formidable Pro V2.02, the process will no longer work.

Discussion closed.