Parser::chunked()

443    protected function chunked()444    {445        if (!preg_match('/^([0-9a-f]+)[^\r\n]*\r\n/i', trim($this->body))) {446            $this->state = self::STATE_EMIT;447            return;448        }449 450        $decoded = '';451        $encoded = $this->body;452 453        while (true) {454            $is_chunked = (bool) preg_match('/^([0-9a-f]+)[^\r\n]*\r\n/i', $encoded, $matches);455            if (!$is_chunked) {456                // Looks like it's not chunked after all457                $this->state = self::STATE_EMIT;458                return;459            }460 461            $length = hexdec(trim($matches[1]));462            if ($length === 0) {463                // Ignore trailer headers464                $this->state = self::STATE_EMIT;465                $this->body = $decoded;466                return;467            }468 469            $chunk_length = strlen($matches[0]);470            $decoded .= substr($encoded, $chunk_length, $length);471            $encoded = substr($encoded, $chunk_length + $length + 2);472 473            // BC for PHP < 8.0: substr() can return bool instead of string474            $encoded = ($encoded === false) ? '' : $encoded;475 476            if (trim($encoded) === '0' || empty($encoded)) {477                $this->state = self::STATE_EMIT;478                $this->body = $decoded;479                return;480            }481        }482    }