As every on suggested above, try this:-
<?php
session_start();
$_SESSION['yans'] = array('A','B','C','D','E');
echo "<pre/>";print_r($_SESSION);die;
?>
Output:- http://prntscr.com/7btkxv
Note:- it’s a simple example given for your understanding. thanks.
solved PHP :Initializing elements of session array