session_unset function is used for removing all variables in a session. For unsetting the session, it must be opened. Let's see in the example.
$_SESSION["email"] = "firstname.lastname@example.org";
echo "Your Email is ".$_SESSION['email'].".<br />";
echo "After Session variable delete <br>";
#check Session variable after unset session
echo "Your Email Id is: ".$_SESSION["email"].".";
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