Sokil\Mongo\Structure::set PHP Метод

    public function set($selector, $value)
    {
        $value = self::prepareToStore($value);
        // modify
        $arraySelector = explode('.', $selector);
        $chunksNum = count($arraySelector);
        // optimize one-level selector search
        if (1 == $chunksNum) {
            // update only if new value different from current
            if (!isset($this->data[$selector]) || $this->data[$selector] !== $value) {
                // modify
                $this->data[$selector] = $value;
                // mark field as modified
                $this->modifiedFields[] = $selector;
            }
            return $this;
        }
        // selector is nested
        $section =& $this->data;
        for ($i = 0; $i < $chunksNum - 1; $i++) {
            $field = $arraySelector[$i];
            if (!isset($section[$field])) {
                $section[$field] = array();
            } elseif (!is_array($section[$field])) {
                throw new Exception('Assigning sub-document to scalar value not allowed');
            }
            $section =& $section[$field];
        }
        // update only if new value different from current
        if (!isset($section[$arraySelector[$chunksNum - 1]]) || $section[$arraySelector[$chunksNum - 1]] !== $value) {
            // modify
            $section[$arraySelector[$chunksNum - 1]] = $value;
            // mark field as modified
            $this->modifiedFields[] = $selector;
        }
        return $this;
    }

 public function bitwiceXor($field, $value)
 {
     $oldFieldValue = (int) $this->get($field);
     $newValue = $oldFieldValue ^ $value;
     parent::set($field, $newValue);
     if ($this->getId()) {
         if (version_compare($this->getCollection()->getDatabase()->getClient()->getDbVersion(), '2.6', '>=')) {
             $this->operator->bitwiceXor($field, $value);
         } else {
             $this->operator->set($field, $newValue);
         }
     }
     return $this;
 }