The PHP team has rushed out the 5.3.8
release to fix a 5.3.7 bug that broke crypt() for a lot of users.
But it turns out that there is another problem: the behavior of
is_a() has changed, with the results that (1) the
autoloader can be triggered, and (2) the return value can change.
This change appears to have caused problems with PEAR, at least; users may
want to be careful about upgrading to this release.
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