session_regenerate_id(); this is not working why???

[php4om]

<?php
session_start();

$old_sessionid = session_id();

session_regenerate_id();
$new_sessionid = session_id();

print "Old Session: $old_sessionid<br>";
print "New Session: $new_sessionid<br>";

print_r($_SESSION);
?>

above program is not working.

[Weedpacket]

I see

Old Session: 06b2cc65475277a2668e713956e2d3bc
New Session: ea18f60653522c92b7420f95355dc9cb
Array
(
)

[php4om]

but it is not working in my server i mean local server.

[Weedpacket]

I suggest you read this.