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Clicking link should expire the session
<img src="http://site.come/logout"/>

<input type="submit" name="logout" value="Logout"/>

<?php
    if(isset($_POST['logout'])) {
        session_destroy();
    }
?>

<!--in the index.php page-->

<a href="logout.php">Logout</a>


<!--in the logout.php page-->

<?php
session_start(); //to ensure you are using same session
session_destroy(); //destroy the session
header("location:http://localhost/moon/index.php");
//to redirect back to "index.php" after logging out
exit();
?>

<?php

if(isset($_GET['expire'])){
session_start();
session_destroy();
}

?>
<a href="session_expr.php?expire">Destroy session</a>