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| Rev 1116 | Rev 1121 | ||
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| Line 275... | Line 275... | ||
| 275 | * @param $to |
275 | * @param $to |
| 276 | * @return int|null |
276 | * @return int|null |
| 277 | */ |
277 | */ |
| 278 | public function distance($to) { |
278 | public function distance($to) { |
| 279 | if (!is_object($to)) $to = OIDplusObject::parse($to); |
279 | if (!is_object($to)) $to = OIDplusObject::parse($to); |
| - | 280 | if (!$to) return null; |
|
| 280 | if (!($to instanceof $this)) return null; |
281 | if (!($to instanceof $this)) return null; |
| 281 | 282 | ||
| 282 | $a = $to->aid; |
283 | $a = $to->aid; |
| 283 | $b = $this->aid; |
284 | $b = $this->aid; |
| 284 | 285 | ||