Second updating page files disappear - php

Question

I have a form with uploading multiple files.
When I upload let's say two images and when I click submit, the images are displayed properly, but when I edit some other input and click submit button, the images are gone.
Here's my code:
<?php
if(isset($_GET['id'])) {
$id = $_GET['id'];
}
$query = "SELECT * FROM posts WHERE id = $id";
$result = $db->query($query);
while($row = $db->fetch_object($result)) {
$id = $row->id;
$title = $row->title;
$body = $row->body;
$status = $row->status;
}
if(isset($_POST['submit'])) {
$title = $_POST['title'];
$body = $_POST['body'];
$image = $_POST['image'];
$status = $_POST['status'];
//if($_FILES['image']['tmp_name']) {
if(!empty($_FILES['image']['name'])) { //Edit
// delete old image
$query = "SELECT * FROM postimage WHERE post_id = $id";
$select_image = $db->query($query);
while($row = $db->fetch_object($select_image)) {
$old = $row->filename;
unlink('../uploads/' . $old);
}
$query = "DELETE FROM postimage WHERE post_id = $id";
$delete_images = $db->query($query);
foreach($_FILES['image']['tmp_name'] as $key => $tmp_name) {
$filename = rand(100,999)."-".$_FILES['image']['name'][$key];
$filetmp = $_FILES['image']['tmp_name'][$key];
if(move_uploaded_file($filetmp, '../uploads/' . $filename)) {
$query = "INSERT INTO postimage(post_id, filename) ";
$query .= "VALUES($id, '$filename')";
$insert_images = $db->query($query);
}
}
}
$query = "UPDATE posts SET ";
$query .= "title = '$title', ";
$query .= "body = '$body', ";
$query .= "status = '$status', ";
$query .= "updated = now() ";
$query .= "WHERE id = $id ";
$update_post = $db->query($query);
//header("Location: posts.php");
}
?>
<form action="" method="post" enctype="multipart/form-data">
<div class="form-item">
<label for="title">Post title</label>
<input type="text" value="<?php echo $title; ?>" name="title">
</div>
<div class="form-item">
<label for="body">Post body</label>
<textarea id="editor" name="body" rows="10" cols="30"><?php echo $body; ?></textarea>
</div>
<div class="form-item">
<label for="image">Image</label>
<?php
$query = "SELECT * FROM postimage WHERE post_id = $id";
$select_image = $db->query($query);
while($row = $db->fetch_object($select_image)) {
$filename = $row->filename;
echo '<img width="100" height="70" src="../uploads/' . $filename . '">';
}
?>
<input type="file" name="image[]" multiple>
</div>
<div class="form-item">
<label for="status">Post status</label>
<select name="status">
<option value="<?php echo $status; ?>"><?php echo $status; ?></option>
<?php
if($status == 'published') {
echo '<option value="draft">draft</option>';
} else {
echo '<option value="published">published</option>';
}
?>
</select>
</div>
<div class="form-item">
<input type="submit" class="form-submit" name="submit" value="Update post">
</div>
</form>
When I'm using simple form with uploading a single image and connects with only one table, I usually fix that problem with this:
if(empty($image)) {
$query = "SELECT * FROM posts WHERE id = $id";
$result = $db->query($query);
while($row = $db->fetch_object($result)) {
$image = $row->image;
}
}
How can I solve this problem using multiple upload input?

Answer 1

EDITED: change it to
if(!empty($_FILES['image']['name']))
because $_FILES['image']['tmp_name'] always return path to temp so jou cannot test it for empty

Answer 2

I've solved the problem.
When using multiple file upload, the if statement has to be changed, so in this case it should be: if(!empty($_FILES['image']['tmp_name'][0]))