CI_DB_active_record::replace PHP Method

    function replace($table = '', $set = NULL)
    {
        if (!is_null($set)) {
            $this->set($set);
        }
        if (count($this->ar_set) == 0) {
            if ($this->db_debug) {
                return $this->display_error('db_must_use_set');
            }
            return FALSE;
        }
        if ($table == '') {
            if (!isset($this->ar_from[0])) {
                if ($this->db_debug) {
                    return $this->display_error('db_must_set_table');
                }
                return FALSE;
            }
            $table = $this->ar_from[0];
        }
        $sql = $this->_replace($this->_protect_identifiers($table, TRUE, NULL, FALSE), array_keys($this->ar_set), array_values($this->ar_set));
        $this->_reset_write();
        return $this->query($sql);
    }