Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc. If the script requires a 
database to demonstrate the issue, please make sure it creates 
all necessary tables, stored procedures etc.

Please avoid embedding huge scripts into the report.

Sorry, I tried to upload an tar.gz archive with the scripts but it failed w/o stopping and thus we got to this :)

Here are the scripts.
server.php:
<?php
require_once 'Zend/XmlRpc/Server.php';

$server = new Zend_XmlRpc_Server();
$server->addFunction('ini_get_all', 'bug');
echo $server->handle();


/**
 * @return array
 */
function iniGetAll() {
    return ini_get_all();
}

client.php:
<?php
require_once 'Zend/XmlRpc/Client.php';
$client = new Zend_XmlRpc_Client('http://localhost/server.php');
var_dump($client->call('bug.ini_get_all'));

We can't use ZF as a base to debug or fix a bug.

Please provide a small self contained script to reproduce this problem. 

But why does it raise an error 500? Any php error? or does it crash?

Closing. Problem occurs only when proprietary Zend extensions are loaded.
Sorry for the bogus.

Closing