Description:
------------
Apache/2.0.49 (Win32) PHP/5.0.0RC2 Server

Using create_function() incorrectly, i.e.:

$y = create_function(NULL, "cos(4);");

...causes instability in PHP itself as no checking is done on the create_function() arguments. Every so often when this script is refreshed, PHP dumps all kinds of garbage followed by what appears to be HTTP headers (viewable in Mozilla Firefox 0.8):

=> d getallheaders 1 1 1 1 1 1 1 1 1 2 ) 1 1 1 1 1 1 [ 4 user 5 ] => 6 Array 1 1 1 1 1 1 1 1 2 ( 1 1 1 1 1 1 1 1 2 ) 1 2 ) 6 0 HTTP/1.1 200 OK Date: Sun, 30 May 2004 19:22:08 (...)

Then the actual script output starts, which is corrupted all the same. Internet Explorer 6 on the same page attempts to refresh the page automatically numerous times, and never finishes.

Could this possibly be the beginning of some kind of exploit in PHP? I have no idea what the output means but I submit it for the benefit of community review.

Reproduce code:
---------------
<?php
/* Refresh constantly to eventually see problem. */
$y = create_function(NULL, 'cos(4);');
print "<pre>";
$x = get_defined_functions();
print_r($x);
print "</pre>";
?>

Expected result:
----------------
Array
(
    [internal] => Array
        (
            [0] => zend_version

(...)

Actual result:
--------------
1 1 1 [ 2 65 5 ] => 8 unixtojd 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 66 5 ] => 8 jdtounix 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 67 5 ] => 9 cal_to_jd 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 68 5 ] => b cal_from_jd 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 69 5 ] => 11 cal_days_in_month 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 70 5 ] => 8 cal_info 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 71 5 ] => b variant_set 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 72 5 ] => b variant_add 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 73 5 ] => b variant_cat 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 74 5 ] => b variant_sub 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 75 5 ] => b variant_mul 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 76 5 ] => b variant_and 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 77 5 ] => b variant_div 1 1 1 1 1 1 1 1 1 1 1 1 1 1 [ 2 78 5 ] => b

(...)