Description:
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The docs for ArrayObject::offsetGet say it will return the value at the passed index or boolean FALSE.

http://www.php.net/manual/en/arrayobject.offsetget.php

This suggests some sort of graceful failure on an undefined index, returning the default value FALSE (never mind the possible ambiguity of this return vs. the stored value FALSE).

In actuality, it returns NULL for an undefined index and fires off the "Undefined index" NOTICE as with regular arrays.

Test script:
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$t = new ArrayObject(array('exists'=>42));
var_dump( $t->offsetGet('non_existent') );

Expected result:
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FALSE 

(and no notice)

Actual result:
--------------
NULL 

with

PHP Notice: Undefined index: non_existent in /code/2DUpLq on line 4