取消设置具有相似名称的所有会话变量

Question

I'm using some $_SESSION variables for filtering many query records that have a similar name (ex. $_SESSION['nameFilter'] or $_SESSION['cityFilter'] and so on).

I'm using a link for resetting these filters, but I want to know if there is a way to unset all $_SESSION variables that have a name that is like:

$_SESSION[(somewords)Filter]

Answer 1

Use foreach to enumerate the keys of $_SESSION[], use substr() to get the last 6 characters of each key, use unset() to (what else?) unset it.

As easy as:

session_start();
foreach (array_keys($_SESSION) as $key) {
    if (substr($key, -6) == 'Filter') {
        unset($_SESSION[$key]);
    }
}