public function findAndModify($p, $cb)
{
$this->_params($p);
$e = explode('.', $p['col'], 2);
$query = ['findAndModify' => $e[1]];
if (isset($p[$k = 'rp'])) {
$v = $p[$k];
if (is_string($v)) {
$v = ['mode' => $v];
}
$query['$readPreference'] = $v;
}
if (isset($p['sort'])) {
$query['sort'] = $p['sort'];
}
if (isset($p['update'])) {
$query['update'] = $p['update'];
}
if (isset($p['new'])) {
$query['new'] = (bool) $p['new'];
}
if (isset($p['remove'])) {
$query['remove'] = (bool) $p['remove'];
}
if (isset($p['upsert'])) {
$query['upsert'] = (bool) $p['upsert'];
}
if (isset($p['where'])) {
$query['query'] = $p['where'];
} elseif (isset($p['query'])) {
$query['query'] = $p['query'];
}
if ($this->safeMode) {
static::safeModeEnc($query);
}
$cb = CallbackWrapper::wrap($cb);
try {
$this->request(self::OP_QUERY, pack('V', $p['opts']) . $e[0] . '.$cmd' . "" . pack('VV', $p['offset'], $p['limit']) . bson_encode($query) . (isset($p['fields']) ? bson_encode($p['fields']) : ''), true, null, function ($conn, $reqId = null) use($p, $cb) {
if (!$conn) {
!$cb || $cb(['$err' => 'Connection error.']);
return;
}
$conn->requests[$reqId] = [$p['col'], $cb, true];
});
} catch (\MongoException $e) {
Daemon::log('MongoClient exception: ' . $e->getMessage() . ': ' . $e->getTraceAsString());
if ($cb !== null) {
$cb(['$err' => $e->getMessage(), '$query' => $query, '$fields' => isset($p['fields']) ? $p['fields'] : null]);
}
}
}