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How to use session in php

Index.php File

<?php
session_start();
$username = $_POST['username'];

if(isset($username))
{

$_SESSION['id'] = $username;

echo "session working your username is ". $_SESSION['id'];
?>
<a href = "logout.php">Logout</a>
<?php
}

else
{

   echo "Login first";
}
?>
<br><br>
<form action = "" method = "POST">
   username: <input type = "text" name="username">
   <input type= "submit">
   </form>

Logout.php File

<?php
session_start();
session_destroy();

?>
<script>
window.location = 'index.php';
</script>

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