Andi Gutmans, one of the main developers behind PHP 5, has a new article on Oracle.com about the new features in PHP 5, as well as tighter integration with Oracle 10g. The bundling of PHP in the upcoming version of Oracle 10g and the PHP extension for Oracle JDeveloper are significant indicators for widespread PHP support by Oracle.

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Updated 2021 : note that the above post is out-of-date, given this post was originally published in 2004, but is left here for archival purposes. I have unlinked the article (http://www.oracle.com/technology/pub/articles/php_experts/FutureofPHP.html) as that is now dead.