data.php

<?php

show('$_GET', $_GET);
show('$_POST', $_POST);
show('$_FILES', $_FILES);
show('apache_request_headers()', apache_request_headers());
show('php://input', file_get_contents('php://input'));

function show($name, $var)
{
    echo '<h2>',$name,'</h2>',"\n";
    debug($var);
}

function debug($var)
{
    echo '<pre>',"\n";
    print_r($var);
    echo '</pre>',"\n";
}