How to get back my data from a button to an other php page -

i have button on php page data on same page. button redirect other php page , want data.

i tried

if(isset($_post['button'])){     echo($data); } 

the isset true (i test string) can't datas other php page.

my form code of button :

   <form action = "/lienpaybox.php" method = "post">       <input type = "submit" name = "button" value = 'submit'>     </form> 

when want pass datas 1 page another, session best bet

all have initiate session.

page1.php --> page contains datas. below code in page1.php

<?php session_start();  $_session['username'] ='mr.x'; $_session['usertype'] = 'level1';  ?> 

page2.php --> page want retrieve datas of page1.php.here code,

<?php session_start(); print_r($_session); //you notice datas previous page being displayed here  ?> 

ofcourse there best practices needs followed while handling sessions. once hang of sessions, can go on link securing sessions in php