是否可以在HTML / PHP中为上传器自动选择文件？

I am developing a Library Management System. An admin side is allowed to enter a new book. I am wondering if it is possible to auto-select a file to upload if the admin leaves it empty?

I used the following html code (among other input) for the form.

<input name="MAX_FILE_SIZE" value="102400" type="hidden">
<input name="image" accept="image/jpeg" type="file">

In the php file that processes the input, I used the following code to upload the file.

$fileName = $_FILES['image']['name'];
$tmpName  = $_FILES['image']['tmp_name'];
$fileSize = $_FILES['image']['size'];
$fileType = $_FILES['image']['type'];

$filePath = $uploadDir . $fileName;

$result = move_uploaded_file($tmpName, $filePath);
if (!$result) {
echo "Error uploading file";
exit;
}

if(!get_magic_quotes_gpc())
{
    $fileName = addslashes($fileName);
    $filePath = addslashes($filePath);
}

The code works perfectly fine. I am just wondering if there is a way to auto-select a default image if the admin leaves the file uploader empty. The image (containing the text "IMAGE NOT AVAILABLE") is already pre-saved on the folder where all uploaded images are saved. How do I select this before saving it to my database?

CHEERS!

You should check if file uploaded to server using is_uploaded_file function. If not, just save the path of your default no-image.gif or something similar.