Not updating a field if no image is inserted - php

Question

I am quite new to PHP, but i'm having a problem with my thought process around some code i am writing.
I am trying to get the below to work so that a user can upload two images in a form, which uploads to the server, and updates the field in SQL, but i'm having a hard time working out how to make it so that the SQL field isn't updated unless an image is uploaded - I've managed to make it work with one image using;
$uploadArtwork = $_FILES['asset_name']['tmp_name'];
if($uploadArtwork == null) {
$sql = "";
}
else {
$sql = "";
}
I am struggling to work out, how i can do it for two images (and eventually more than two images?)
Tried a lot of googling, but without much luck yet!

Answer 1

$uploadArtwork1 = $_FILES['asset_name1']['tmp_name'];
$uploadArtwork2 = $_FILES['asset_name2']['tmp_name'];
// Image1 and/or image2 was uploaded successfully
if(($uploadArtwork1 != null) || ($uploadArtwork2 != null)) {
$sql = "";
// No images were selected, or there were problems uploading them
} else {
$sql = "";
}
Though it would be better to check $_FILES['asset_name']['error'] == UPLOAD_ERR_OK to determine if an image was uploaded successfully:
$uploadArtwork1 = $_FILES['asset_name1']['error'];
$uploadArtwork2 = $_FILES['asset_name2']['error'];
// Image1 and/or image2 was uploaded successfully
if(($uploadArtwork1 == UPLOAD_ERR_OK) || ($uploadArtwork2 == UPLOAD_ERR_OK)) {
// Do something with $_FILES['asset_name1']['tmp_name'] and $_FILES['asset_name2']['tmp_name']
$sql = "";
// No images were selected, or there were problems uploading them
} else {
$sql = "";
}
Update:
require_once("Inc/classCloud.php");
$sql = "UPDATE assets SET asset_title='$post_asset_title'";
if ($uploadArtwork != null) {
$getImageID= $res['data'];
$sql .= ", asset_name='$getImageID'";
}
if ($uploadMock != null) {
$getImageID2= $res2['data'];
$sql .= ", product_artwork='$getImageID2'";
}
$sql .= " WHERE asset_id='$post_asset_id'";

Answer 2

Here is a basic structure to work with.
Basically looping through all uploaded files and if they have been found then move them to a new location on the server and write the entry to database.
This code has not been tested.
<?php
// Loops through all possible file uploads.
foreach ($_FILES as $file) {
// Checks a file has been chosen.
if (isset($file['tmp_name']) && !empty($file['tmp_name'])) {
// Checks the uploaded (object) is a file.
if (is_file($file['tmp_name'])) {
// The filepath for the uploaded file.
$destination = 'LOCATION TO MOVE THE UPLOADED FILE TO';
/*
* Perform SQL Write here
*/
if (WRITE WAS SUCCESSFUL) {
// Move FIle
move_uploaded_file($file['tmp_name'], $destination);
}
}
}
}