Jelix already supports some of PHP 5.2 features when you make your own Jelix build with "5.2" as value in the PHP_VERSION_TARGET building parameter. But default builds availabled in the download repository are made for PHP 5.0 and later. However, this will not be the case at the latest, the February 5th, 2008. Jelix Developers agreed with the GoPHP5 campaign recommendations, which encourages both PHP projects and web hosts to support only PHP 5.2 and later. So, next February 5, 2008, Jelix will officially support all php 5.2 features and default avalaibled packages will be built for PHP 5.2 or later.