PHP 5.6 – looking forward

Having taken a look in the past, now it’s time to look into the future, namely 5.6 (PHP 7 is the future future, we’ll get there eventually). So I’d like to make some predictions of what would work well and not so well and then see if it would make sense in two years or turn out completely wrong.

High impact

I expect those things to be really helpful for people going to PHP 5.6:

Constant expressions – the fact that you could not define const FOO = BAR + 1; was annoying for some for a long time. Now that this is allowed I expect people to start using it with gusto.

Variadics – while one can argue variadics are not strictly necessary, as PHP can already accept variable number of args for every function, if you’re going to 5.6 the added value would be enough so you’d probably end up using them instead of func_get_args and friends.

Operator overloading for extensions – the fact that you can sum GMP numbers with + is great, and I think more extensions like this would show up. E.g., for business apps dealing with money ability to work with fractions without precision loss is a must, and right now one has to invent elaborate wrappers to handle it. Having an extension for this would be very nice. Finding a way to transition from integer to GMP when number becomes too big would be a great thing too.
Still not convinced having it in userspace is a great idea, what C++ did to it is kind of scary.

phpdbg – not having gdb for PHP was for a long time one of the major annoyances. I expect to use it a lot.

Low impact

Function and constant importing – this was asked for a long time, but I still have hard time believing a lot of people would do it, since people who need imports usually are doing it in OO way anyway.


OpenSSL becoming strict with regard to peer verification by default may be a problem, especially for intranet apps running on self-signed certs. While this problem is easily fixable and the argument can be made that it should have been like this from the start – too many migrations go on very different paths depending on if it requires changing code/configs or not.

Adoption – again, with 5.5 adoption being still in single digits, I foresee a very slow adoption for 5.6. I don’t know a cure for “good enough” problem and I can understand people that do not want to move from something that already works, but look at the features! Look at the performance! I really hope people would move forward on this quicker.

While 5.4 will always have a special place in my heart, I hope people now staying on 5.2 and 5.3 would jump directly to 5.6 or at least 5.5. The BC delta in 5.5 and 5.6 is much smaller – I think 5.3->5.4 was the highest hurdle recently, and 5.4 to 5.5 or 5.6 should go much smoother.

Anything you like in PHP 5.6 and I forgot to mention? Anything that you foresee may be a problem for migration? Please add in comments. 

PHP 5.4 – looking back

With 5.6.0 having been released and 5.4 branch nearing its well-earned retirement in security-fixes-only status I decided to try and revive this blog. As the last post before the long hiatus was about the release of the 5.4, I think it makes sense to look back and see how 5.4 has been doing so far.


Release process. Combined with RFCs and git. It’s hard to believe we used not to have it. RFC process is working great, git makes all the processes tick and we have scheduled releases, working CI setup and much better predictability and management of releases overall. It’s no big deal unless you remember how it was before.

Built-in webserver. It really helps when you can just set up something browseable (is this a word? now it is) with PHP alone, without bothering with Apache setup and other moving parts. This is again a case of something that you don’t realize how much you missed it until you start using it.

$this support in closures. Having to write 5.3-compatible code for the last couple of years, I can’t emphasize enough how sorely it was missing in 5.3. I really regret the fact we could not get it into 5.3.

Syntax sugar like [] and <?= working everywhere. It’s a small thing but it adds up. I usually do not give much weight to saving couple of keystrokes and so on, but these to me really improve coder’s quality of life.

Removal of old “features” (since they ended up in the dump, is it right to call them features anymore?). Nobody is missing the safe mode or magic quotes or register_globals. Good riddance. Wish we parted ways sooner.


Traits. I must say I haven’t seen big adoption of the traits feature. Yes, of course people use it, there are tutorials, there are articles, etc. But at the same time compared to how much namespaces were needed or how much closures proved to be a great help, traits adoption, IMHO, remains lukewarm at best. To me, it has not lived yet up to its promise. Maybe I’m missing something, tell me if you have great examples there.

Adoption. This is a problem for new PHP versions and for developers of distributable PHP software – PHP versions are becoming “good enough” and people are reluctant to move forward, which also delays adoption of new features by library & packaged software writers. Look at the numbers: almost 3/4 of the PHP developers are using EOLed versions! 5.4 adoption is low at 22% and 5.5 adoption is abysmal. I hope that more streamlined release cycles and heightened attention to BC matters would bend this tendency. But so far it is not encouraging. WordPress numbers look even worse.

Don’t know

callable type. How wide is the usage? How useful it is in practice? Is it being used in major projects? I really don’t know.

Performance. It feels weird to put an obviously great improvement in this category. I would expect performance be a major driver for people to move forward, but the numbers suggest otherwise. As much as I love the performance improvements (a lot!), I really have no idea on how much it influenced the community and made them go to 5.4 (or beyond). Are there any surveys, links, studies, etc. in this regard? I see a lot of talk about performance but how many people also walk the walk? Are the numbers quoted above misleading?

mysqlnd. 5.4 is the first version where mysqlnd is the default mode of doing mysql. It has better performance, great features and I’ve been using it for years without a problem. But how widely it is adopted – do people still prefer the old way or love the new one? Do they use the plugin API widely?

Anything else?

Did I forget to mention something that really made your life better in 5.4? Did I conceal some flop that you wish we didn’t do? Please tell.

5.2->5.3 migration script

Wrote an article on DevZone about migration script from php 5.2 to 5.3. This little script can save some time when you consider to move your codebase to run under 5.3 (which you should 🙂 ).

This script doesn’t do everything I’d like it to do – specifically, I’d like to make it try to figure out all kinds of messy reference scenarios, but I’m not sure how yet. And if you have other idea, please comment there or here. It’s on public git, so you can take it and modify if you wish.