Description:
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This is NOT a bug report regarding the implementation of spl_object_hash() but rather its documentation!

It says there (http://de.php.net/manual/en/function.spl-object-hash.php) for the return value of function spl_object_hash():

"A string that is unique for each object and is always the same for the same object."

I used this function for a while now, also in production environment. Recently I coincidentally discovered a user-contributed comment saying that the IDs of destroyed objects will be reused.

The Documentation itself should say so, I think.

While debugging some other issue in my code I actually observed a case where this would have led to a serious problem (for now, I just appended the current microtime, since the class I'm dealing with is kinda huge and takes a while to instantiate. Still sucks of course.).

Reproduce code:
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var_dump(spl_object_hash(new stdClass()), spl_object_hash(new stdClass()));

Expected result:
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"A string that is unique for each object and is always the same for the same object."

Actual result:
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"A string that is unique for each currently existing object and is always the same for the same object."

or something like that