Description:
------------
get_defined_functions() returns junk values after the key 1048 in the resulted array.
Look at the reproduce code.
Also tested in 5.2.0 - not reproduced.

Reproduce code:
---------------
<?php

$funcs = get_defined_functions();
print_r($funcs['internal']);

?>

Expected result:
----------------
The result array should be list of internal PHP functions

Actual result:
--------------
The part of resulted array:

    ...
    [1043] => zend_current_obfuscation_level
    [1044] => zend_runtime_obfuscate
    [1045] => zend_obfuscate_class_name
    [1046] => zend_get_id
    [1047] => zend_loader_version
    [1048] => zend_optimizer_version
    [1049] => uer1qc[<lm*uj
hb0
    [1050] => pf?c9
zei9whzf
    [1051] => jyjl
u%(i
    [1052] => fiecaz9/hxv^%"pmx
c`y2?
    [1053] => ri*vh1.+8d8c]_'sc
    [1054] => tntp\q4=zt~np{cq{vk(s|ts
    ....