Keeper.php

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<?php
#require_once 'Zend/Pdf/Trailer.php';

class Zend_Pdf_Trailer_Keeper extends Zend_Pdf_Trailer
{
    private $_context;

    private $_prev;


    public function __construct(Zend_Pdf_Element_Dictionary $dict,
                                Zend_Pdf_Element_Reference_Context $context,
                                Zend_Pdf_Trailer $prev = null)
    {
        parent::__construct($dict);

        $this->_context = $context;
        $this->_prev    = $prev;
    }

    public function setPrev(Zend_Pdf_Trailer_Keeper $prev)
    {
        $this->_prev = $prev;
    }

    public function getPrev()
    {
        return $this->_prev;
    }

    public function getPDFLength()
    {
        return $this->_context->getParser()->getLength();
    }

    public function getPDFString()
    {
        return $this->_context->getParser()->getString();
    }

    public function getRefTable()
    {
        return $this->_context->getRefTable();
    }

    public function getLastFreeObject()
    {
        try {
            $this->_context->getRefTable()->getNextFree('0 65535 R');
        } catch (Zend_Pdf_Exception $e) {
            if ($e->getMessage() == 'Object not found.') {
                return 0;
            }

            throw new Zend_Pdf_Exception($e->getMessage(), $e->getCode(), $e);
        }
    }
}