Opis\Closure\SecureClosure::getSecurityProvider PHP Method

    public static function getSecurityProvider()
    {
        return static::$securityProvider;
    }

 protected function s($closure, $bindThis = false)
 {
     if ($closure instanceof Closure) {
         if (null === SecureClosure::getSecurityProvider()) {
             SecureClosure::setSecurityProvider(new DefaultSecurityProvider('secret'));
         }
         $closure = new SecureClosure($closure, $bindThis);
     }
     return unserialize(serialize($closure))->getClosure();
 }