密码未在sql数据库中更新

Question

<?php
session_start();

if(isset($_POST['chPasswordSubmit'])) {

  include('dbh.inc.php');

  $oPassword = mysqli_real_escape_string($conn, $_POST['oldPassword']);
  $nPassword1 = mysqli_real_escape_string($conn, $_POST['nPassword1']);
  $nPassword2 = mysqli_real_escape_string($conn, $_POST['nPassword2']);
  $chEmail = $_SESSION['u_email'];

  if (empty($oPassword) || empty($nPassword1) || empty($nPassword2)) {
    echo "Prosim vyplňte všetky polia";
    exit();
  } else {
    if (strlen($nPassword1) < 8) {
      echo "heslo musí mať aspoň 8 znakov";

    } else {
      if ($_POST['nPassword1'] !== $_POST['nPassword2']) {
        echo "heslá sa musia zhodovať";
      } else {
        $sql = "SELECT user_password FROM users1 WHERE user_email='$chEmail'";
        $result = mysqli_query($conn, $sql);
        $row = mysqli_fetch_assoc($result);
        $hashPasswordCheck = password_verify($oPassword, $row['user_password']);
        if ($hashPasswordCheck == false) {
          echo "Nesprávne heslo";
          exit();
        } elseif ($hashPasswordCheck == true)
          $hashedPassword = password_hash($nPassword1, PASSWORD_BCRYPT);
        $sql = "UPDATE users1 SET user_password='$hashedPassword' WHERE user_email='$chEmail'";
      }
    }
  }
}

?>

我的密码不想在我的sql数据库中更新。我不知道如何解决这个问题。有人可以编辑我的最后一部分代码到函数内容吗？