PHP多个图像上传并保存到数据库

Question

我有一个将用户输入数据保存到数据库的表单。在这种形式我有一个上传功能。表单按原样执行，它将数据保存到数据库以及图像。问题是，假设我有三个图像，现在发生了什么，它是否为三个图像中的每一个在DB中创建了一个新行。

例如，我填写表格一次，但上传三张图片。现在发生的事情是，我完成表单的数据在数据库中创建了三次，每个数据都有自己的ID来计算上传的三个图像。

这是表格：

 <form method="post" action="submit_vehicle.php" enctype="multipart/form-data">
            <input name="submit" type="submit" class="button" value="Save">
            <a role="button" href="#" class="button success">Save & New</a>
            <a role="button" href="manage_vehicles.php" class="button secondary">Cancel</a>
            <div class="row">
                <div class="large-6 columns">
                    <label>Stock Number
                        <input name="stock_number" type="text" placeholder="Stock Number" />
                    </label>
                </div>
                <div class="large-6 columns">
                    <label>VIN Number
                        <input name="vin_number" type="text" placeholder="VIN Number" />
                    </label>
                </div>
            </div>
            <div class="row">
                <div class="large-6 columns">
                    <label>Make
                        <input name="make" type="text" placeholder="Make" required/>
                    </label>
                </div>
                <div class="large-6 columns">
                    <label>Model
                        <input name="model" type="text" placeholder="Model" required/>
                    </label>
                </div>
            </div>
            <div class="row">
                <div class="large-6 columns">
                    <label>Colour
                        <input name="colour" type="text" placeholder="Colour" required/>
                    </label>
                </div>
                <div class="large-6 columns">
                    <label>Milage
                        <input name="milage" type="text" placeholder="Milage" required/>
                    </label>
                </div>
            </div>
            <div class="row">
                <div class="large-6 columns">
                    <label>Year
                        <input name="year" type="text" placeholder="Year" required/>
                    </label>
                </div>
                <div class="large-6 columns">
                    <label>Price
                        <input name="price" type="text" placeholder="Price" required/>
                    </label>
                </div>
            </div>
            <div class="row">
                <div class="large-12 columns">
                    <label>Vehicle Description
                        <textarea name="description" placeholder="Describe this vehicle"></textarea>
                    </label>
                </div>
            </div>
            <div class="row">
                <div class="large-12 columns">
                    <label>Choose images for this vehicle (Note: Supported file types are JPEG, JPG and PNG)
                        <input type="file" name="files[]" multiple="">
                    </label>
                </div>
            </div>
            <h4 class="border"></h4>
            <input type="submit" class="button" name="submit" value="Save">
            <a role="button" href="#" class="button success">Save & New</a>
            <a role="button" href="manage_vehicles.php" class="button secondary">Cancel</a>
        </form>

这是PHP：

if (isset($_POST['submit'])) {

//Get form data
$stock_number = $_POST['stock_number'];
$vin_number = $_POST['vin_number'];
$make = $_POST['make'];
$model = $_POST['model'];
$colour = $_POST['colour'];
$milage = $_POST['milage'];
$year = $_POST['year'];
$price = $_POST['price'];
$description = $_POST['description'];

$errors = array();

if (isset($_FILES['files'])) {

    foreach ($_FILES['files']['tmp_name'] as $key => $tmp_name) {
        $file_name = $key . $_FILES['files']['name'][$key];
        $file_size = $_FILES['files']['size'][$key];
        $file_tmp = $_FILES['files']['tmp_name'][$key];
        $file_type = $_FILES['files']['type'][$key];

        if ($file_size > 2097152) {
            $errors[] = 'Files must be smaller that 2MB';
        }

        $directory = 'uploaded_images/' . $file_name;

        $sql = "
                INSERT INTO vehicles
                (stock_number, vin_number, make, model, colour, milage, year, price, description, file_name, file_size, file_type, file_path)
                VALUES
                ('$stock_number', '$vin_number', '$make', '$model', '$colour', '$milage', '$year', '$price', '$description', '$file_name', '$file_size', '$file_type', '$directory')
            ";

        mysqli_query($conn, $sql);
    }

    if (empty($errors)) {
        header('Location: manage_vehicles.php');
        exit();
    }
}

}