You are asking us to replace the following
$newavatar = $_FILES['user_avatar'];
if ($userdata['user_avatar'] == "" && !empty($newavatar['name']) && is_uploaded_file($newavatar['tmp_name'])) {
if (preg_match("/^[-0-9A-Z_\.\[\]]+$/i", $newavatar['name']) && $newavatar['size'] <= 30720) {
but should it be
$newavatar = $_FILES['user_avatar'];
if ($data2['user_avatar'] == "" && !empty($newavatar['name']) && is_uploaded_file($newavatar['tmp_name'])) {
if (preg_match("/^[-0-9A-Z_\.\[\]]+$/i", $newavatar['name']) && $newavatar['size'] <= 30720) {
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