BigInteger.php

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<?php
class Zend_Crypt_Math_BigInteger
{

    protected $_math = null;

    public function __construct($extension = null)
    {
        if ($extension !== null && !in_array($extension, array('bcmath', 'gmp', 'bigint'))) {
            #require_once('Zend/Crypt/Math/BigInteger/Exception.php');
            throw new Zend_Crypt_Math_BigInteger_Exception('Invalid extension type; please use one of bcmath, gmp or bigint');
        }
        $this->_loadAdapter($extension);
    }

    public function __call($methodName, $args)
    {
        if(!method_exists($this->_math, $methodName)) {
            #require_once 'Zend/Crypt/Math/BigInteger/Exception.php';
            throw new Zend_Crypt_Math_BigInteger_Exception('invalid method call: ' . get_class($this->_math) . '::' . $methodName . '() does not exist');
        }
        return call_user_func_array(array($this->_math, $methodName), $args);
    }

    protected function _loadAdapter($extension = null)
    {
        if ($extension === null) {
            if (extension_loaded('gmp')) {
                $extension = 'gmp';
            //} elseif (extension_loaded('big_int')) {
            //    $extension = 'big_int';
            } else {
                $extension = 'bcmath';
            }
        }
        if($extension == 'gmp' && extension_loaded('gmp')) {
            #require_once 'Zend/Crypt/Math/BigInteger/Gmp.php';
            $this->_math = new Zend_Crypt_Math_BigInteger_Gmp();
        //} elseif($extension == 'bigint' && extension_loaded('big_int')) {
        //    #require_once 'Zend/Crypt_Math/BigInteger/Bigint.php';
        //    $this->_math = new Zend_Crypt_Math_BigInteger_Bigint();
        } elseif ($extension == 'bcmath' && extension_loaded('bcmath')) {
            #require_once 'Zend/Crypt/Math/BigInteger/Bcmath.php';
            $this->_math = new Zend_Crypt_Math_BigInteger_Bcmath();
        } else {
            #require_once 'Zend/Crypt/Math/BigInteger/Exception.php';
            throw new Zend_Crypt_Math_BigInteger_Exception($extension . ' big integer precision math support not detected');
        }
    }

}