PHP unlink() problem with files named with multiple extensions - php

Question

I'm encountering an issue I've never come across before. I have some images uploaded as JPG or PNG with a duplicate of the image in WebP format, eg in this file naming convension:
https://example.com/uploads/memory-day.png >
https://example.com/uploads/memory-day.png.webp
If I delete a file through PHP using the unlink() function like normal, it works fine for everything else until I delete the PNG duplicate image. When I do that, the WebP file is also deleted and I can't see how it's happening -- is it a weird issue in the unlink() function with a file having a double extension? I can't seem to replicate it unless it's there's a WebP file involved.
For clarity, here's the PHP code that deletes the files (and yeah, I know it needs to be a prepare statement, I haven't updated it yet):
if(isset($_POST['delete'])) {
$countG = 0;
$err = 0;
foreach($_POST['delFile'] as $actionID) {
$action_id = $conn->real_escape_string($actionID);
$query = $conn->query("SELECT `filename`, `dir` FROM `fileuploads` WHERE `id` = '$action_id'");
$delF = $query->fetch_assoc();
$filenameDel = StripSlashes($delF['filename']);
$filenameDir = StripSlashes($delF['dir']);
if(file_exists($_SERVER['DOCUMENT_ROOT'] . $filenameDir . "/" . $filenameDel)){
if(unlink($_SERVER['DOCUMENT_ROOT'] . $filenameDir . "/" . $filenameDel)) {
if(file_exists($_SERVER['DOCUMENT_ROOT'] . $filenameDir . "/auto_thumbs/" . $filenameDel)) {
unlink($_SERVER['DOCUMENT_ROOT'] . $filenameDir . "/auto_thumbs/" . $filenameDel);
}
$delquery = $conn->query("DELETE FROM `fileuploads` WHERE `id` = '$action_id'");
$countG++;
} else {
$err++;
}
} else {
$err++;
if(!file_exists($_SERVER['DOCUMENT_ROOT'] . $filenameDir . "/" . $filenameDel)) {
//Remove from db if file is not there physically
$delquery = $conn->query("DELETE FROM `fileuploads` WHERE `id` = '$action_id'");
}
}
}
if($countG > 0) {
$green = 1;
$message1 = "$countG File(s) Deleted!";
}
if($err > 0) {
$red = 1;
$message2 = "Error deleting $err files!";
error_log(print_r(error_get_last(), TRUE));
}
}