<?php

/**
 * Run this script with a query string in the URL and a
 * specific script set in form action attribute, and
 * $_GET is not populated.
 *
 * Run this script with a query string in the URL and
 * form action unset (action=""), and $_GET is populated.
 *
 * This behavior might be confusing initially, but is
 * not incorrect, since $_GET is populated whenever params
 * appear in the url.
 */

if (empty($_POST)) {
?>
    <form action="" method="post">
        <input type="text" name="test" />
    </form>
<?php
} else {
    var_dump($_POST, 'POST');
    var_dump($_GET, 'GET');
    var_dump($_REQUEST, 'REQUEST');
}