php function array_key_exists() not supported in version 5.3 anymore [replaced by property_exists()]

i have upgraded my local devel server (debian 5 unstable)
from php 5.2.10 to php 5.3 a while ago.

and while working on a new block i found out that function array_key_exists()
has a compatibility issue with php version 5.3.

it is replaced with property_exists()

http://il2.php.net/array_key_exists

PHP Version Description
5.3.0 This function doesn't work with objects anymore, property_exists() should be used in this case.

and there is allot (398 uses) of places in the code of version 1.9.5+ of that function.
http://xref.moodle.org/_functions/index.html#array_key_exists

i set this issue to major, i hope it is a minor one, thou.