yii\sphinx\QueryBuilder::buildInCondition PHP Method

    public function buildInCondition($indexes, $operator, $operands, &$params)
    {
        if (!isset($operands[0], $operands[1])) {
            throw new Exception("Operator '{$operator}' requires two operands.");
        }
        list($column, $values) = $operands;
        if ($values === []) {
            if ($operator === 'IN') {
                if (empty($column)) {
                    throw new Exception("Operator '{$operator}' requires column being specified.");
                }
                $column = $this->db->quoteColumnName($column);
                return "({$column} = 0 AND {$column} = 1)";
            }
            return '';
        }
        if ($column === []) {
            return '';
        }
        if ($values instanceof Query) {
            // sub-query
            list($sql, $params) = $this->build($values, $params);
            $column = (array) $column;
            if (is_array($column)) {
                foreach ($column as $i => $col) {
                    if (strpos($col, '(') === false) {
                        $column[$i] = $this->db->quoteColumnName($col);
                    }
                }
                return '(' . implode(', ', $column) . ") {$operator} ({$sql})";
            } else {
                if (strpos($column, '(') === false) {
                    $column = $this->db->quoteColumnName($column);
                }
                return "{$column} {$operator} ({$sql})";
            }
        }
        $values = (array) $values;
        if (count($column) > 1) {
            return $this->buildCompositeInCondition($indexes, $operator, $column, $values, $params);
        }
        if (is_array($column)) {
            $column = reset($column);
        }
        foreach ($values as $i => $value) {
            if (is_array($value)) {
                $value = isset($value[$column]) ? $value[$column] : null;
            }
            $values[$i] = $this->composeColumnValue($indexes, $column, $value, $params);
        }
        if (strpos($column, '(') === false) {
            $column = $this->db->quoteColumnName($column);
        }
        if (count($values) > 1) {
            return "{$column} {$operator} (" . implode(', ', $values) . ')';
        } else {
            $operator = $operator === 'IN' ? '=' : '<>';
            return $column . $operator . reset($values);
        }
    }