Dibi\Result::fetchAssoc PHP Method

    public final function fetchAssoc($assoc)
    {
        if (strpos($assoc, ',') !== FALSE) {
            return $this->oldFetchAssoc($assoc);
        }
        $this->seek(0);
        $row = $this->fetch();
        if (!$row) {
            return [];
            // empty result set
        }
        $data = NULL;
        $assoc = preg_split('#(\\[\\]|->|=|\\|)#', $assoc, NULL, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
        // check columns
        foreach ($assoc as $as) {
            // offsetExists ignores NULL in PHP 5.2.1, isset() surprisingly NULL accepts
            if ($as !== '[]' && $as !== '=' && $as !== '->' && $as !== '|' && !property_exists($row, $as)) {
                throw new \InvalidArgumentException("Unknown column '{$as}' in associative descriptor.");
            }
        }
        if ($as === '->') {
            // must not be last
            array_pop($assoc);
        }
        if (empty($assoc)) {
            $assoc[] = '[]';
        }
        // make associative tree
        do {
            $x =& $data;
            // iterative deepening
            foreach ($assoc as $i => $as) {
                if ($as === '[]') {
                    // indexed-array node
                    $x =& $x[];
                } elseif ($as === '=') {
                    // "value" node
                    $x = $row->{$assoc[$i + 1]};
                    continue 2;
                } elseif ($as === '->') {
                    // "object" node
                    if ($x === NULL) {
                        $x = clone $row;
                        $x =& $x->{$assoc[$i + 1]};
                        $x = NULL;
                        // prepare child node
                    } else {
                        $x =& $x->{$assoc[$i + 1]};
                    }
                } elseif ($as !== '|') {
                    // associative-array node
                    $x =& $x[$row->{$as}];
                }
            }
            if ($x === NULL) {
                // build leaf
                $x = $row;
            }
        } while ($row = $this->fetch());
        unset($x);
        return $data;
    }