$_SESSION AND LOGIN PAGE WITH PHP [closed]

I made login page with database and home page I tied the database with login page... connection code:

function login ($email,$password){
    $con=mysqli_connect("localhost","root","","cv");
    
    $sql = "SELECT * FROM `user` 
    where `email` = '$email' && `password`= $password ";
    
    $q=mysqli_query($con,$sql);

   $res = mysqli_fetch_assoc($q);
   
    return $res ;
}

and i want to use session on it so i wrote a simple code in login page :

<?php 

session_start ();
include "lib/user.php";

if(isset($_POST["email"])){
    
  $email =$_POST["email"];
  $password=$_POST["password"];

  $res= login($email,$password);
    
   if(!empty ($res)){
        $_SESSION[`user`] =$res ;
        header ('LOCATION:home.php');
    }else{
      $erorrrr='email or password is not found!!';
     }


}


?>

and this one in home page :

?php
session_start ();
if (empty($_SESSION['user'])){
  header("LOCATION:login.php");
}

?>

finally the page never loged in !!Although the email and password are in the database... i think this problem just in $_SESSION how can i fix it and take sessions from users

source https://stackoverflow.com/questions/73673807/session-and-login-page-with-php