Question

i want to redirect login.php to index.php when $_SESSION[‘user’] is not empty (user logged in)

<?php
    session_start();
    if (isset($_SESSION['user'])){
        header ('refresh:3 ; URL:index.php');
    }
?>

but when user log in the page doesn’t redirect to the index.php

Answer 1

This should work:

<?php
    session_start();
    if (isset($_SESSION['user'])){
        header('Location: http://www.yoursite.com/');
        die();
    }
?>

If you want to redirect the user after x senconds, then use

    <?php
        session_start();
        if (isset($_SESSION['user'])){
            header( "refresh:3;url=whatever.php" ); 
        }
    ?>