I would suggest :
a) Make sure $arr[(string)$obj] works (I see no reason for it not to).
b) Look into how to support a unique identifier (-1 on a hash value).
Two main questions are how this thing looks like, and whether it's
explicit (you need to call some function/method to get it) or
implicit (e.g. $arr[$obj]).
A Unique indentifier could look something like "Classname#Object id"
e.g. "SimpleXMLElement#1".
Andi
P.S.-Yep, sticking to bullets keeps emails brief :)
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