Session does not end properly - php

Question

So normally my session should end when I press logout button on my page but when I go to the previous page via the button (top left). I just go back to my page logged in..
This is my login page code
<?php
session_start();
$errors = array();
if(isset($_POST["name"]) and isset($_POST["password"])) {
$conn = mysqli_connect("localhost", "root", "123", "whoosh") or die("No connection made: ".mysqli_connect_error());
$name = $_POST["name"];
$password = $_POST["password"];
if (empty($name)) { array_push($errors, "Ename is required"); }
if (empty($password)) { array_push($errors, "Password is required"); }
if (count($errors) == 0) {
$query = "SELECT * FROM tbl_user WHERE name='$name' AND password='$password'";
$results = mysqli_query($conn, $query);
$user = mysqli_fetch_assoc($results);
if ($user) { // if user exists
if ($user['name'] === $name and $user['password'] === $password) {
$_SESSION['user'] = $user['id'];
header('location: mainsite.php');
}
}
}
}
?>
This is the code I put on my main site thats allows me to logout.
<?php
session_start();
if(isset($_GET['logout'])){
$_SESSION['name'] = null;
header('Location:http://leopard.med.agfa.be/leopard/website/logIn.php');
}
session_destroy();
?>
So, why is my session not working properly and doesnt log out completely?

Answer 1

Try this one! I dont see any where you passing name to session.
if(isset($_GET['logout'])){
// Initialize the session
session_start();
// Unset all of the session variables
session_unset();
$_SESSION = array();
// Destroy the session.
session_destroy();
unset($_SESSION['user']);
// Redirect to login page
header('Location:http://leopard.med.agfa.be/leopard/website/logIn.php');
exit();
}
Note: I used both unset() and destroy() functions you can use one.

Answer 2

Change the logout script to this:
<?php
if(isset($_GET['logout'])){
// null the _SESSION
$_SESSION = null;
// unset $_SESSION variable for the run-time
session_unset();
// destroy session data in storage
session_destroy();
// last, redirect
header('Location:http://leopard.med.agfa.be/leopard/website/logIn.php');
}
?>