Author: Rossiani Wijaya
MDL-25186: add environmental check to recommend PHP 5.3.3
http://git.moodle.org/gw?p=moodle.git;a=commit;h=39f2bbf3fb6b560fa237ef9ab16265967e8cfd33
http://github.com/moodle/moodle/commit/39f2bbf3fb6b560fa237ef9ab16265967e8cfd33
+ 2.0 en [php533warning,core_admin]