PHP Session Destroy - php

Question

How do I destroy a session in php?
the thing is when the user clicks the logout button the session will end and he will be redirected to the index.php here's my code
Customer.php
<?php
session_start();
#include("Connection.php");
if (isset($_POST['submit'])) {
$name = $_POST['customerName'];
$_SESSION['user'] = $name;
}
if (isset($_SESSION['user'])) { echo "Hello {$_SESSION['user']}, welcome back"; }
else{echo "walang tao";}
$sql="INSERT INTO ORDERS(Name) VALUES('$name')";
mysql_query($sql);
session_destroy();
?>
<button></button>
and this is from the index.php where the user wants to log in again
<?PHP
/* this must go before any html */
session_start();
if (isset($_SESSION['user'])) {
header("location: Customer.php");
}
?>
<div class="sign">
<h2>Welcome</h2>
<form action = "Customer.php" method = "POST">
Customer Name:<input type = "text" name="customerName">
<input type = "submit" name = "submit">
</form>

Answer 1

session_start();
session_destroy();

Answer 2

You may also used unset() function for free up session Environment.
if (isset($_SESSION['user']))
{
unset($_SESSION['user']);
header('location:index.php');
}

Answer 3

Include this file in your header and set the required settings in file.
It should work well.
<?php
session_cache_expire(20);
if (!isset($_SESSION)) {
session_start();
}
// set timeout period in seconds
$inactive = 1200; // timeout for the session
// check to see if $_SESSION['timeout'] is set
if(isset($_SESSION['timeout']) ) {
$session_life = time() - $_SESSION['timeout'];
if($session_life > $inactive) {
$_SESSION = array();
if(isset($_COOKIE[session_name()])) {
setcookie(session_name(), '', time()-42000, '/');
}
session_destroy();
header("Location: index.php"); // or whatever you prefer to do.
}
}
$_SESSION['timeout'] = time();
?>

Answer 4

If you aren't using the auth component then its really easy
public function logout(){
$this->Session->destroy();
// no cake we really want you to delete it because you suck
$this->Session->destroy();
}

Answer 5

//If you want complete destroy session then you can write.
session_destroy();
The session_unset() //function frees all session variables currently registered.