PHP 4.2.1 is released today, it's a bug fix release which addresses some 
serious bugs (and a lot of other little bugs) in 4.2.0. The full release 
announcement follows below:


This bug fix release solves a few bugs found in PHP 4.2.0. PHP 4.2.1 
includes the following fixes:

    * Fix for the MySQL extension not be able to connect to a MySQL 
    * Fix for a crash in the COM extension when using an outproc server.
    * Fix for SID logic in the session extension.
    * Fixes for the mbstring extension, including SJIS directory name 
      handling and mb_output_buffer().
    * Fix for a bug in socket_select() that could cause unexpected 
      behavior when using a statement like $w = $e = array($sock);
    * Almost full DOM compliance for the domxml extension, and fixes for 
      several functions.
    * Safe_mode checks for show_source(), parse_ini_file() and rmdir().

For a full list of changes in PHP 4.2.1, see the NEWS file. 


PHP 4.2.1 also has improved (but still experimental) support for Apache 
version 2. We do not recommend that you use this in a production 
environment, but feel free to test it and report bugs to the bug system. 

External variables

We would also like to attend you on a big change in PHP 4.2.0 concerning 
variable handling. External variables (from the environment, the HTTP 
request, cookies or the web server) are no longer registered in the global 
scope by default. The preferred method of accessing these external 
variables is by using the new Superglobal arrays, introduced in PHP 4.1.0. 
More information about this change:

    * PHP Manual: Predefined variables

    * The PHP 4.1.0 release announcement

    * Thomas Oertli's article on secure programming in PHP


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