Warning: mkdir(): File exists

The file transferring to my upload folder is working well but I have a warning in mkdir. It says file exist but the picture and folder generates own name. I don't know what warning is determining. ``` include 'connect.php'; $dir = substr(uniqid(), -7); // Uniqid for subdirectory $path = "uploads/$dir/"; // uploads/subdirectory/ // Make directory $valid_formats = array("jpg", "png", "jpeg", "kml"); $max_file_size = 2097152; $count = 0; // Loop $_FILES to execute all files if (!empty($_FILES)) { foreach ($_FILES['files']['name'] as $f => $name) { if ($_FILES['files']['error'][$f] == 4) { continue; // Skip file if any error found } if ($_FILES['files']['error'][$f] == 0) { if ($_FILES['files']['size'][$f] > $max_file_size) { $message[] = "$name is too large!."; continue; // Skip large files } elseif (!in_array(pathinfo($name, PATHINFO_EXTENSION), $valid_formats)) { $message[] = "$name is not a valid format"; continue; // Skip invalid file formats } else { // No error found! Move uploaded files mkdir($path, 0700); $ext = pathinfo($_FILES['files']['name'][$f], PATHINFO_EXTENSION); $uniq_name = substr(uniqid(), -5) . '.' . $ext; $dest = $path . $uniq_name; if (move_uploaded_file($_FILES["files"]["tmp_name"][$f], $dest)) { // more logic } } } } } ```