$target_dir = "../public/images/";

if (isset($_POST["name"]) && isset($_FILES["fileToUpload"]["name"])) {
    $nameFile = strtotime("now") . $_FILES["fileToUpload"]["name"];
    $target_file = $target_dir . basename($nameFile);
    $uploadOk = 1;
    $imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));

    if ($_FILES["fileToUpload"]["size"] > 500000) {
        $message = "File quá lớn, vui lòng sử dụng file nhẹ hơn!";
        $uploadOk = 0;
    }

    if (
        $imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
        && $imageFileType != "gif"
    ) {
        $message = "File của bạn không phải file ảnh, vui lòng chọn file khác!";
        $uploadOk = 0;
    }


    // Check if $uploadOk is set to 0 by an error
    if ($uploadOk == 0) {
        echo "<script type='text/javascript'>alert('$message');</script>";
        // if everything is ok, try to upload file
    } else move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file);