problems with session in PHP

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PHP

session

Im stuck with a piece of code for many hours but still couldn't find a error.

I'm setting a session variable in one page and doing it echo in another page but there isn't any output in the second page.

page1.php

session_start();
$_SESSION['id'] = 1;
echo $_SESSION['id'];
header("Location: page2.php");
?>

output of page1.php

1


page2.php

session_start();
echo " $_SESSION['id']" ;
?>

output of page2.php

No output.


Why this happens and what to do get the output in page2.php as 1 ??