In my local machine and online server, i have a folder 'test' and three files in it (one.php,two.php,three.php) .

one.php

<?php
ob_start();
session_start();
$_SESSION['one'] = 1;
header('Location:two.php');
exit();
?>

two.php

<?php
ob_start();
session_start();
$_SESSION['two'] = 2;
header('Location:three.php');
exit();
?>

three.php

<?php
ob_start();
session_start();
echo '<pre>';print_r($_SESSION);
?>

i tarayıcıda one.php alırken ben bir çıktı almak

//Local machine

array[one] =1  
array[two] =2

this is correct

// Online Server

array[one] =1

this is not correct

What is wrong with this? i donot getting any warning,

Herkes bana söyleyin lütfen, sorun ne?