PHP form submit ends after 271 submitted variables

I got a little problem regarding the submit of multiple forms:

I'm trying to submit a bigger number of $_POST-variables, however, my server-side script ends (or just breaks down) after, in total 271 form variables, are submitted.

Trying on localhost, everything works just fine, without any issues. Here, in total 771 post variables are submitted.

I've also done a little research so far, trying to figure what kind of variables I could possibly change in order to configure a bigger data range or something similar.

So here's my server configuration:

max_execution_time  30  30
max_input_nesting_level 64  64
max_input_time  60  60
max_input_vars  1000    1000
memory_limit    256M    256M
post_max_size   8M  8M

localhost configuration:

max_execution_time  30  30
max_file_uploads    20  20
max_input_nesting_level 64  64
max_input_time  60  60
max_input_vars  1000    1000
memory_limit    256M    256M
post_max_size   8M  8M

As you can see, it's the same configuration... I also have the suhosin - extension installed on my server, default configuration. I'm not that familiar with this extension, but using default values should have that impact (i guess :))

Server-PHP Version: 5.3.9
Local: 5.3.17

The problem is quite similar to this one.

I'm trying to solve the problem for weeks now, if you have any kind of ideas.. it would just be great ;)

thanks :)

UPDATE:

if i'm using this approach (thanks):

$pairs = explode("&", file_get_contents("php://input"));
$vars = array();
foreach ($pairs as $pair) {
    $nv = explode("=", $pair);
    $name = urldecode($nv[0]);
    $value = urldecode($nv[1]);
    $vars[$name] = $value;
}
print_r($vars);

i see all form variables and content that i'm displaying before. However, accessing the $_POST variables directly by using

isset($_POST['LanguageContentForm']

and saving that to a variable doesn't work.. :/