src/Parser/Util/ParseUtil.php
private static function parseIdentifierEscape(string $stmt, int $offset)
    {
        $sb = '';
        for (++$offset,$stemLen = strlen($stmt); $offset < $stemLen; ++$offset) {
            $c = $stmt[$offset];
            if ('`' == $c) {
                if ($offset + 1 < strlen($stmt) && '`' == $stmt[$offset + 1]) {
                    ++$offset;
                    $sb .= '`';
                } else {
                    break;
                }
            } else {
                $sb .= $c;
            }
        }

        return $sb;
    }
private static function parseIdentifierEscape(string $stmt, int $offset)
    {
        $sb = '';
        for (++$offset,$stemLen = strlen($stmt); $offset < $stemLen; ++$offset) {
            $c = $stmt[$offset];
            if ('`' == $c) {
                if ($offset + 1 < strlen($stmt) && '`' == $stmt[$offset + 1]) {
                    ++$offset;
                    $sb .= '`';
                } else {
                    break;
                }
            } else {
                $sb .= $c;
            }
        }

        return $sb;
    }
<code>AS `abc`</code>.

@param string $stmt
@param int    $offset

@return string