Session is not destroying though called session_destroy() - php

Question

I am developing system with sessions in which I have put the code to start session after successful login and assigned values to session variables like $_SESSION['email']. Also, I have put a session destroy code, but the session doesn't seem to destroy. I have following files - index.php
This file grants the access to user for correct credentials with following code:
if(password_verify($password,$dbpass)){
$stmt = $conn->prepare("SELECT name, image FROM admins WHERE email=?");
$stmt->bind_param("s",$email);
$stmt->execute();
$stmt->store_result();
$stmt->bind_result($name,$image);
$stmt->fetch();
$_SESSION['name'] = $name;
$_SESSION['email'] = $email;
$_SESSION['image'] = $image;
header("Location:insert.php");
}
It works fine by setting session variables and redirects to intended file. In the file insert.php, I have imported file session.php which has below code:
session_start();
if(!isset($_SESSION['email'])){
header("Location:index.php");
}
also, I have a logout.php file which has following code:
if(isset($_SESSION['email'])){
session_destroy();
}
header("Location: index.php");
After running logout.php, if i again tries to access file insert.php, it opens, though the session file is imported in it. It should be redirected to index.php file. What is going wrong? Anyone please help.

Answer 1

Your session and your $_SESSION server variables are seperate.
The session will be broken but the variable won't be empty.
Try this:
session_start();
session_destroy();
//Now you can choose whether you want to unset all sessions, or specific one(s):
$unset_sessions = ['email'];
foreach($_SESSION as $session => $session_value) {
if (in_array($session, $unset_sessions))
unset($_SESSION[$session]);
}
//Or all of them:
$_SESSION = [];
Thought it'd be fun to also create a function out of this:
function breakSessions($specifics= []) {
if (!empty($specific)) { //Handle specifics
foreach($_SESSION as $session => $session_value) {
if (in_array($session, $specifics))
unset($_SESSION[$session]);
}
} else {
$_SESSION = [];
}
}
breakSessions(['login', 'remember_me']) //Specifics;
breakSessions(); //All of them```

Answer 2

if(isset($_SESSION['email'])){
session_start();
session_destroy();
}
header("Location: index.php");
You can't destroy a session without having "start" before. It's reccomended to have a session file which contains "session_start();" which you build templates from so that every page always have "session_start();"