Here's an odd question.
Is there any way (without knowing what variables have been set) to display the output of all the variable on your page.
ie.
$a=9;
$blah=10
$why_do_i_need_this_pointless_functions='yes';

ie. if there was a function like:
show_vars();
and it would output
9
10
yes

Remember 'without' knowing what variables are set, or even the variable names.

for example if it was all in a post I could easily:
foreach ($_POST as $key=>$value) {
echo $key." ".$value."<br />";
}

but if the variable have been set in the page and not in a post,get,session or cookie.

Strange request I know....

I did some research and found a few things, edited a few of them together to get this, which you should be able to edit as needed:

PHP Code:

<?php function vars($vars, $exclude){
    $temp1 = array_values(array_diff(array_keys($vars), $exclude));
    $temp2 = array();
    while (list($key, $value) = each($temp1)) {
        global $$value;
        $temp2[$value] = $$value;
    }
    return $temp2;
}
$exclude = array('GLOBALS', '_FILES', '_COOKIE', '_POST', '_GET', '_SERVER', '_ENV', 'HTTP_ENV_VARS', 'HTTP_POST_VARS', 'HTTP_GET_VARS', 'HTTP_COOKIE_VARS', 'HTTP_SERVER_VARS', 'HTTP_POST_FILES', '_REQUEST', 'exclude');
$vars = get_defined_vars();
print "<pre>";
print_r(vars($vars, $exclude));
print "</pre>";?>