PHP Code Function to Unset Multiple Session Variables

To Unset Multiple Session Variables in a Function in PHP, Add a Related Tag to Session Variables.

For Example if you are setting SESSION variables on a log in page, create session variables like $_SESSION["login-firstname"], $_SESSION["login-lastname"], $_SESSION["login-age"]. Then to unset them at once using the function below ...

unsetSessionVariablesByTag("login-");

/* ----------------------------------------------------- loop through all session variables and unset or destroy the ones with a certain tag ie $_SESSION["tag_username"] to destroy all session variables that start with tag_ ----------------------------------------------------- */ function unsetSessionVariablesByTag($tag) { // loop through all session variables foreach ($_SESSION as $key => $value) { // see if the session variable starts with the given tag if (strpos($key, $tag) === 0) { unset($_SESSION[$key]); } } }