check if upload is not null code example
Example: php check if post file is empty
if ($_FILES['cover_image']['size'] == 0 && $_FILES['cover_image']['error'] == 0)
{
// cover_image is empty (and not an error)
}
if ($_FILES['cover_image']['size'] == 0 && $_FILES['cover_image']['error'] == 0)
{
// cover_image is empty (and not an error)
}