phpversion()
5.2.6RC4-pl0-gentoo
php_uname()
Linux bigtime 2.6.24-gentoo-r3 #1 SMP Sun Mar 30 20:43:30 CEST 2008 x86_64
$array1
Array
(
    [test1] => unclobbered
    [test2] => dontclobber
    [test3] => Array
        (
            [testarray1] => unclobbered2
            [testarray2] => dontclobber
        )

)
$array2
Array
(
    [test1] => clobbered
    [test3] => Array
        (
            [testarray1] => clobbered2
        )

)
array_merge_clobber($array1, $array2)
Array
(
    [test1] => clobbered
    [test2] => dontclobber
    [test3] => Array
        (
            [testarray1] => clobbered2
            [testarray2] => dontclobber
        )

)
$array1+$array2Array
(
    [test1] => unclobbered
    [test2] => dontclobber
    [test3] => Array
        (
            [testarray1] => unclobbered2
            [testarray2] => dontclobber
        )

)
$array2+$array1Array
(
    [test1] => clobbered
    [test3] => Array
        (
            [testarray1] => clobbered2
        )

    [test2] => dontclobber
)