I've recently started work on porting our internal company PHP patches over to PHP 5.4 as part of our migration from 5.3 to 5.4 One of those patches is the type-hint patch that introduces scalar type hints to PHP (something I wrote originally for PHP 5.1), something that was briefly included in PHP 5.4 but then (unfortunately) reverted.
Since I feel that type-hints is a pretty handy feature to have as it eliminates many possible errors, improves code interrogation and addresses some of the limitations currently being worked-around via annotations I've decided to share this patch with the community. The patch is available for download at: http://ilia.ws/patch/php54_type_hints.txt it applies cleanly against PHP 5.4.8 as well as 5.4 branch (5.4.9RC1). I suspect it will work with earlier versions of PHP 5.4 as well. The patch includes full test coverage around the new functionality and all of the existing tests continue to pass (so nothing is broken).