$_Files Field 'Tmp_Name' Has No Value on .Jpg File Extension

Filled up $_FILES doesn't return file extension

$_FILES['images']['tmp_name'] does not contain an extension, that is the temp file PHP made of the uploaded file.

If you want the filename with extension of the file that was uploaded from the users PC, you need to look in $_FILES['images']['name']

So

foreach($_FILES['images']['tmp_name'] as $index => $tmpName) {
if(!empty($tmpName) && is_uploaded_file($tmpName)) {
$img_url = url_rewrite($intitule)
.'-'
. time()
. $i
. '.'
. strtolower(substr(strrchr($_FILES['images']['name'][$index], '.'),1));
// changed here -----------------------------^^^^^^^^^^^^^^^^
$gallery = $gallery . '|' . $img_url;
move_uploaded_file( $tmpName, $dir_upload . '/' . $img_url);
}
$i++;
}

Also you can simplify that bunch of functions that get the extension to

        $img_url = url_rewrite($intitule)
.'-'
. time()
. $i
. '.'
. pathinfo($_FILES['images']['name'][$index], PATHINFO_EXTENSION);

$gallery = $gallery . '|' . $img_url;

How do I use imagejpeg() with $_FILES[file][tmp_name]

Because a common way to handle temporary files is to create the file, open it, and then unlink/delete it without closing the handle. This gives you the ability to use disk while ensuring that the files are deleted/unlinked when the process ends. That is what is happening, why move_uploaded_file() exists at all, and why you must use it before any other operation on that file.

There is also the additional layer of "do you actually want this file to really exist?" because otherwise anyone can POST to any PHP script and have files created in the filesystem.

TLDR: You must use move_uploaded_file() before attempting to use the file.

File Upload Not Uploading Files on File Extension Check

$name = $_FILES['file']['name'];
$tmp_name = $_FILES['file']['tmp_name'];
$pre_ext = explode(".", $name);

Should fix it. I recommend to check the file itself, and not only the extension.
tmp_name is the temp name on your server, usually something like /tmp/random8y7ofad9



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