Pop\Pdf\Object\Object::__toString PHP Метод

    public function __toString()
    {
        $matches = array();
        // Set the content stream.
        $stream = null !== $this->stream ? "stream" . $this->stream . "endstream\n" : '';
        // Set up the Length definition.
        if (strpos($this->def, '/Length ') !== false && strpos($this->def, '/Length1') === false && strpos($this->def, '/Image') === false) {
            preg_match('/\\/Length\\s\\d*/', $this->def, $matches);
            if (isset($matches[0])) {
                $len = $matches[0];
                $len = str_replace('/Length', '', $len);
                $len = str_replace(' ', '', $len);
                $this->def = str_replace($len, '[{byte_length}]', $this->def);
            }
        } else {
            if (strpos($this->def, '/Length') === false) {
                $this->def .= "<</Length [{byte_length}]>>\n";
            }
        }
        // Calculate the byte length of the content stream and swap out the placeholders.
        $byteLength = $this->compress && function_exists('gzcompress') && strpos($this->def, ' /Image') === false && strpos($this->def, '/FlateDecode') === false ? $this->calcByteLength($this->stream) . " /Filter /FlateDecode" : $this->calcByteLength($this->stream);
        $data = str_replace('[{obj_index}]', $this->index, $this->data);
        $data = str_replace('[{obj_stream}]', $stream, $data);
        $data = str_replace('[{obj_def}]', $this->def, $data);
        $data = str_replace('[{byte_length}]', $byteLength, $data);
        // Clear Length definition if it is zero.
        if (strpos($data, '<</Length 0>>') !== false) {
            $data = str_replace('<</Length 0>>', '', $data);
        }
        return $data;
    }