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Announcements group tis php.net...
PHP 4.1.1 Released!
Due to a few bugs in PHP 4.1.0, we decided to release PHP 4.1.1. The
bugs that were fixed are not major ones but minor ones, which could
be annoying if you get bitten by them.
Our recommendation is that people who already upgraded to PHP 4.1.0
do not need to upgrade to PHP 4.1.1 unless they're experiencing one
of the described bugs. Read the full release announcement