Trailer.php

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<?php
abstract class Zend_Pdf_Trailer
{
    private static $_allowedKeys = array('Size', 'Prev', 'Root', 'Encrypt', 'Info', 'ID', 'Index', 'W', 'XRefStm', 'DocChecksum');

    private $_dict;

    private function _checkDictKey($key)
    {
        if ( !in_array($key, self::$_allowedKeys) ) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception("Unknown trailer dictionary key: '$key'.");
        }
    }


    public function __construct(Zend_Pdf_Element_Dictionary $dict)
    {
        $this->_dict   = $dict;

        foreach ($this->_dict->getKeys() as $dictKey) {
            $this->_checkDictKey($dictKey);
        }
    }

    public function __get($property)
    {
        return $this->_dict->$property;
    }

    public function __set($property, $value)
    {
        $this->_checkDictKey($property);
        $this->_dict->$property = $value;
    }

    public function toString()
    {
        return "trailer\n" . $this->_dict->toString() . "\n";
    }


    abstract public function getPDFLength();

    abstract public function getPDFString();

    abstract public function getLastFreeObject();
}