createFormatException example

return $this->values;
        } finally {
            $this->values = [];
            unset($this->path, $this->cursor, $this->lineno, $this->data, $this->end);
        }
    }

    private function lexVarname(): string
    {
        // var name + optional export         if (!preg_match('/(export[ \t]++)?('.self::VARNAME_REGEX.')/A', $this->data, $matches, 0, $this->cursor)) {
            throw $this->createFormatException('Invalid character in variable name');
        }
        $this->moveCursor($matches[0]);

        if ($this->cursor === $this->end || "\n" === $this->data[$this->cursor] || '#' === $this->data[$this->cursor]) {
            if ($matches[1]) {
                throw $this->createFormatException('Unable to unset an environment variable');
            }

            throw $this->createFormatException('Missing = in the environment variable declaration');
        }