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233 | * @param $to |
233 | * @param $to |
234 | * @return int|null |
234 | * @return int|null |
235 | */ |
235 | */ |
236 | public function distance($to) { |
236 | public function distance($to) { |
237 | if (!is_object($to)) $to = OIDplusObject::parse($to); |
237 | if (!is_object($to)) $to = OIDplusObject::parse($to); |
- | 238 | if (!$to) return null; |
|
238 | if (!($to instanceof $this)) return null; |
239 | if (!($to instanceof $this)) return null; |
239 | 240 | ||
240 | $a = $to->php; |
241 | $a = $to->php; |
241 | $b = $this->php; |
242 | $b = $this->php; |
242 | 243 |