พี่ครับ สอบถามปัญหา Call to underfined function mysqli_stmt_get_resultt()

<?php
    require 'connectdb.php';
    $now = date("Y-m-d H:i:s");
    $ipaddress = $_SERVER['REMOTE_ADDR'];
    $user_email = mysqli_real_escape_string($dbcon,$_POST['email']);
    $user_password = mysqli_real_escape_string($dbcon,$_POST['password']);
    
    $salt = 'tikde78uj4ujuhlaoikiksakeidke';
    $hash_user_password = hash_hmac('sha256', $user_password, $salt);
    $sql2= "UPDATE tb_user SET user_login_last= '$now' WHERE user_email='".$user_email."'";
    $sql_ip= "UPDATE tb_user SET user_ip= '$ipaddress' WHERE user_email='".$user_email."'";  
    
    $sql = "SELECT * FROM tb_user WHERE user_email=? AND user_password=?";
    $stmt = mysqli_prepare($dbcon, $sql);
    mysqli_stmt_bind_param($stmt,"ss", $user_email,$hash_user_password);
    mysqli_execute($stmt);
    $result_user = mysqli_stmt_get_result($stmt);
    if ($result_user->num_rows == 1) {
        session_start();        
        $row_user = mysqli_fetch_array($result_user,MYSQLI_ASSOC);
        $_SESSION['user_id'] = $row_user['user_id'];
        if ($row_user['user_status']== 500){
            $_SESSION['is_admin']=500;
            header("Location:../index.php");
        }else {
            $_SESSION['is_member'] = 0;
            $_SESSION['user_email']= $row_user['user_email'];
            $last = mysqli_query($dbcon, $sql2);
            $user_ip=  mysqli_query($dbcon, $sql_ip);
            header("Location:../index.php");
        }
      
    } else {
        echo "ผู้ใช้หรือรหัสผ่านไม่ถูกต้อง";
        header("Location:login.php");
    }
    ?>