<?php
    if (isset($_POST["update"])) {
        $file = $_FILES["file"];
        $fileName = $file["name"];
        $fileTMP = $file["tmp_name"];
        $fileSize = $file["size"];
        $fileType = $file["type"];
        $fileError = $file["error"];

        $fileExp = explode(".", $fileName);
        $fileExpAct = strtolower(end($fileExp));
        $allowed = array("jpg","jpeg","png","gif");
        if (in_array($fileExpAct,$allowed)) {
            if ($fileError === 0) {
                if ($fileSize < 10000000) {
                    $fileNewName = uniqid("",true).".".$fileExpAct;
                    $destination = "upload/".$fileNewName;
                    move_uploaded_file($fileTMP, $destination);
                    header("Location: index.php?success");
                }
            }
        }
    }
?>