php session related help needed

Or maybe I didn't understand your question? If so, please elaborate.

It's confusing do you want to change session name or session value if you want to change session value it is possible.
Like:

<?php session_start();
$abc="Welcome";
$_SESSION['value']=$abc;
echo $_SESSION['value'];//Here session value is Welcome
$newval="Now I am changing the Value";
$_SESSION['value']=$newval;
echo $_SESSION['value']; //Here session value is changed.

?>

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Hi Thanks for the quick answers and solution

i just wanted to change session value and now it works

Thanks