PHP sessions not working at all

Question

I have tested php sessions with this function

session_start();

$_SESSION['test'][] = time();

header('Content-type: text/plain');
print_r($_SESSION);

In theory, it should return one more array element each time I reload the page. But in my case, for some reason, it always displays a single element.

So I'm stuck, please help!

UPDATED

PHP version on my server is 5.3.13 Here is what i have in session section

Answer 1

A workaround to try...

session_start();

if(isset($_SESSION['test'])){
array_push($_SESSION['test'], time());}
else {
$_SESSION['test']= time();}

header('Content-type: text/plain');
print_r($_SESSION);

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