โค้ด PHP เออเร่อค่าช่วยด้วยค่าา

คือหนูจะเขียนโค้ดสร้างหน้าล็อคอินค่ะปล้วมันเออเร่อ โค้ดประมาณนี้คะ

<?php
    require 'connectdb.php';
    
    $login_username = mysqli_real_escape_string ($db,$conn,$_POST['username']);
    $login_password = mysqli_real_escape_string ($db,$conn,$_POST['password']);
    
    $salt = 'sdctu39ijuchoplkacxzbvnmjhto';
    $hash_login_password = hash_hmac ('sha256', $login_password, $salt);
    
    $sql = "SELECT * FROM tb_login WHERE login_username=? AND login_password=?";
    $stmt = mysqli_prepare($db,$conn,$sql);
    mysqli_stmt_bind_param($stmt,"ss",$login_username,$hash_login_password);
    mysqli_execute($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['login_id'] = $row_user['login_username'];
        header("Location: main.php");
    } else {
        echo "ผู้ใช้หรือรหัสผ่านไม่ถูกต้อง";
    }


เออเร่อแบบนี้ค่ะ

Warning: mysqli_real_escape_string() expects exactly 2 parameters, 3 given in /home/cabox/workspace/login.php on line 4

Warning: mysqli_real_escape_string() expects exactly 2 parameters, 3 given in /home/cabox/workspace/login.php on line 5

Warning: mysqli_prepare() expects exactly 2 parameters, 3 given in /home/cabox/workspace/login.php on line 11

Warning: mysqli_stmt_bind_param() expects parameter 1 to be mysqli_stmt, null given in /home/cabox/workspace/login.php on line 12

Warning: mysqli_execute() expects parameter 1 to be mysqli_stmt, null given in /home/cabox/workspace/login.php on line 13

Fatal error: Call to undefined function mysqli_stmt_get_result() in /home/cabox/workspace/login.php on line 14