public function distance(Node $node)
{
#fwrite(STDOUT, __FUNCTION__.''."\n");
$rv = array_fill(0, static::ID_LEN_BYTE, 0);
#ve($rv);
if ($node && $this !== $node) {
$thisId = $this->getId();
$nodeId = $node->getId();
#ve($thisId);
#ve($nodeId);
for ($idPos = 0; $idPos < static::ID_LEN_BYTE; $idPos++) {
$rv[$idPos] = $thisId[$idPos] ^ $nodeId[$idPos];
#fwrite(STDOUT, __FUNCTION__.' pos: '.$idPos.' -> '.$rv[$idPos]."\n");
}
}
return $rv;
}