Description:
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The following message arises:

session_set_save_handler(): Argument 2 is not a valid callback

it doesn't matter if there is valid callback or not, the function crashes under all circumstances, if the handler is stored in a class

Reproduce code:
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session_set_save_handler(array ($this,'lsess_open'), array ($this,'lsess_dummy'), array ($this, 'lsess_read'), array ($this, 'lsess_write'), array ($this, 'lsess_destroy'), array($this, 'lsess_gc'));

The handler are all in the same class defined as function. With all previous versions of PHP it works fine.

Expected result:
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No error, just accept callbacks.

Actual result:
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error message (warning):

session_set_save_handler(): Argument 2 is not a valid callback