Safe.php

class Safe
{
  protected $value;
  
  public function __construct($value) { $this->value = $value; }
  
  public function __call($method, $args)
  {
    if (is_object($this->value) && method_exists($this->value, $method)) {
      return new self(call_user_func_array([$this->value, $method], $args);
    }

    return new self(null);
  }
}