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So, When Should I Upgrade to PHP 5?
If you have a development area, you can download a beta version of PHP 5 and install it. As with all beta releases, there will be bugs as well as items not yet implemented, and even items that are currently implemented that may end up being scrapped before the final release. If you are intrigued by the new featured listed in this chapter, I encourage you to follow the betas as they evolve, installing and testing with each one. You will then be ready to immediately switch to PHP 5 in a production environment, when the PHP Developers Group indicates the first nonbeta is ready for action.
Backward Compatibility
The changelog and PHP manual always indicates when a new implementation will cause problems in previous versions, so at least read the changelog thoroughly if not the manual entries for your favorite functions. However, the vast majority of PHP 5 focuses on additional functionality rather than completely replacing existing elements, you may find that none of your scripts require a rewrite. Requiring a rewrite and rewriting scripts for the sake of utilizing new functionality are completely differentyou may want to rewrite to take advantage of new object-oriented functionality, but you may not have to. If your code is primarily procedural (as with the scripts in this book), there's a better than 95% chance that no rewrites will be necessary.
