Cml\Db\Base::arrToCondition PHP Метод

    protected function arrToCondition($arr, $tableName)
    {
        empty($tableName) && ($tableName = Cml::getContainer()->make('cml_route')->getControllerName());
        /*
        //这个应该开发人员自己判断。框架不做额外开销
        $dbFields = $this->getDbFields($tableName, $tablePrefix);
         foreach (array_keys($arr) as $key) {
             if (!isset($dbFields[$key]))  unset($arr[$key]); //过滤db表中不存在的字段
         }
        */
        $s = $p = '';
        $params = [];
        foreach ($arr as $k => $v) {
            if (is_array($v)) {
                //自增或自减
                switch (key($v)) {
                    case 'inc':
                        $p = "`{$k}`= `{$k}`+" . abs(intval(current($v)));
                        break;
                    case 'dec':
                        $p = "`{$k}`= `{$k}`-" . abs(intval(current($v)));
                        break;
                    case 'func':
                        $func = strtoupper(key(current($v)));
                        $funcParams = current(current($v));
                        foreach ($funcParams as $key => $val) {
                            if (!isset($dbFields[$val])) {
                                $funcParams[$key] = '%s';
                                $params[] = $val;
                            }
                        }
                        $p = "`{$k}`= {$func}(" . implode($funcParams, ',') . ')';
                        break;
                    default:
                        //计算类型
                        $conkey = key($v);
                        if (!isset($dbFields[$conkey])) {
                            $conkey = $k;
                        }
                        if (!in_array(key(current($v)), ['+', '-', '*', '/', '%', '^', '&', '|', '<<', '>>', '~'])) {
                            throw new \InvalidArgumentException(Lang::get('_PARSE_UPDATE_SQL_PARAMS_ERROR_'));
                        }
                        $p = "`{$k}`= `{$conkey}`" . key(current($v)) . abs(intval(current(current($v))));
                        break;
                }
            } else {
                $p = "`{$k}`= %s";
                $params[] = $v;
            }
            $s .= (empty($s) ? '' : ',') . $p;
        }
        $this->bindParams = array_merge($params, $this->bindParams);
        return $s;
    }