src/web/Session.php
public function delete(...$args) {
        $this->open();

        foreach ($args as $key) {
            unset($this->_data[$key]);
        }

        return $this;
    }
public function delete(...$args) {
        $this->open();

        foreach ($args as $key) {
            unset($this->_data[$key]);
        }

        return $this;
    }
Removes a variable in the session array.

$session->delete('foo');

@param   string $key,... variable name
@return  $this