Sunday, July 16, 2006

PHP 5 Adoption has Tipped!

PHP 5 was released in July 2004. Since its release two years ago, there has been a lot of talk about its adoption rate and whether it will surpass the PHP 4 installed base. Even a very narrow Google query will point you to a large amount of articles and blog entries on the subject. In December 2005, I was interviewed for and already pointed out then, that judging by support calls we get for our various products at Zend, almost 50% of development in PHP is being done on PHP 5. Still many weren't sure whether to believe that statistic as Web crawling stats in favor of PHP 4 were still showing a completely different picture.

No doubt that it will still take some time for PHP 5 to reach PHP 4's existing installed base. The main reason for this are the numerous PHP 4-based applications that were built over the years, and if it's not broken, don't fix it. Even at Zend, we have some apps which don't need to be maintained anymore, so we still run PHP 4 for those. But pretty much all new development is done with PHP 5.

That said, I think when judging adoption, the most important statistic is still understanding what people developing and building Web sites with PHP are actually using today. Last week I decided to check up on our support statistics again and see how things have changed in the last few months. I was pretty amazed with the latest results. Although I knew many were waiting for PHP 5.1 before upgrading, its release in last November seems to have created a huge increase in PHP 5 adoption. In July over 74% of support tickets were by customers using PHP 5 (and remember we do support both versions). You can see the results (in %) in the following graph. PHP 4 and PHP 5 are of course inverses of each other.

I've added a trendline to the graph which gives a good idea of how adoption seems to be quickly accelerating since the release of PHP 5.1. I'm the last one to recommend trusting such extrapolations on data, but there definitely seems to be some kind of trend here, and I think it's past the point of no return.

P.S. - Thanks to Shahar Evron, from our support team and contributor to the Zend Framework for getting me these stats.


  1. Mr. Gutmans, that's FUD!

  2. If you use your support system as a basis for this graph, couldn't it be that PHP4 is still used a lot more, but PHP5 just needs a lot more support?

    (probably not, but still a problem to derive any conclusion from these numbers)

  3. Okay, people can stop giving you crap about this, since you already said "I'm the last one to recommend trusting such extrapolations on data..." and that says it. Cool: a trend. We all know it may or may not mean something, but we also know it at least shows something in that direction, even if it just comes from a skewed sample.

    Here, have another example in the form of an informal poll: Which version of PHP do you have actively installed?

    It has a similarly narrow selection of developers (specifically Debian Administrators or those interested in learning to Admin Debian machines), and it currently shows the following results:

    PHP 3 <-> 0% (5 votes)
    PHP 4 <-> 41% (299 votes)
    PHP 5 <-> 36% (263 votes)
    PHP 6 <-> 2% (19 votes)
    No PHP! <-> 18% (131 votes)
    Total 717 votes

    With the usual warnings about standard deviation, this means that we can only really take from this one that PHP4 and PHP5 run about neck and neck (well, when it comes to people who answer polls about versions of PHP on this particular site).

    So people can stop reacting to your overly-optimistic sounding title for this now, right? Right?

  4. I would suspect that a significant portion of this is represented by three aspects:

    a) there are significantly less new 4x deployments happening out there than a year ago;

    b) those who are in 4x have fewer questions at this point since it's mature; and

    c) those who are converting are running into those little implementation differences that drive us nuts. ;)

    Of course, this is all conjecture.

  5. Hi All,

    I think people are moving to PHP5 more
    rapidly than ever before, is because the adoption rate of using frameworks such as symfony, cakePHP, Zend and other MVC apps had gathered momentum in the past 6 months or so.


  6. <a href="">AmbienLifer</a>7/13/2007 06:05:00 AM


  7. <a href="">Viagra</a>7/14/2007 10:01:00 PM


  8. Really excellent information. I would like to share another source for impotence treatment in uk like Viagra, Cialis, Levitra, a HealthExpress MHRA reviewed and GMC certified doctors online clinic provide free online consultation for impotence, obesity, hair loss, quit smoking and influenza.

  9. Hello, I have two student loans plus school expense on a credit card. I was thinking about consolidating them. I am almost completed, I go part time and to a school that does not accept federal loans. The current loan is a private student loan and has been closed and sold to another institution. To get more money I would have to get another student loan that would make three loans. Please give me any advice.
    sudipta das
    federal grants

  10. Once a man suffers from erectile dysfunction or impotency, he becomes unable to facilitate erections necessary for sexual intercourse and at the same time has to undergo a tremendous amount of psychological distress. But just after the approval of viagra by FDA the drug has been successfully treating impotency throughout the world. So, get hold of Viagra for adequate relief from impotency and for comprehensive tidbits on Viagra, log in to the website

  11. Once you find yourself in the grip of erectile dysfunction, you can opt for the anti-impotency medicine viagra to relieve yourself from the shackles of the disorder. But before getting hold of the medicine and administering it in accordance with the instructions of the doctor, it would be considerably useful to you if you obtain a fair account of Viagra tidbits and for this purpose, you can visit the url

  12. Researchers at the Medical Research Council's Human Reproductive Sciences unit in Edinburgh are close to developing a potential rival for Viagra. Washington Viagra is now a decade old and is used by an estimated million men to treat erectile dysfunction.

    order levitra online in usa.

  14. If I were gold für wow a boy again,world of warcraft gold I would practice perseverance wow gold cheap more often,maple meso and never give up a thing because it was or inconvenient. If we want light,Maple Story Account we must conquer darkness. Perseverance can sometimes equal genius in its gold kaufen “There are only two creatures,”cheap maplestory mesos syas a proverb, “who can surmount the pyramids—the eagle and the snail.” If I were a boy again,wow geld I would school myself into a habit of attention;maple mesos I would let nothing come between me and the subject in hand.maple story power leveling I would remember that a good skater never tries to skate in two directions at once.billig wow gold The habit of attention becomes part of our life, if we begain early enough. I often hear grown up people say maple story items“ I could not fix my attention on the sermon or book, although I wished to do so” , wow powerlevelingand the reason is, the habit was not formed in youth. If I were to live my life over again,wow leveling I would pay more attention to the cultivation of the memory. I would strengthen that faculty by every possible means,wow power leveling and on every possible occasion.maplestory powerleveling It takes a little hard work at first to remember things accurately;cheap archlord gold but memory soon helps itself, and gives very little trouble. It only needs early cultivation to become a power.

  15. Due to the fact that not everyone can afford the high prices of the brand name Viagra, manufacturers have created a generic viagra version of it, a copy containing the same ingredients and formula, producing the same effects but having a different look. Generic Viagra online is intended for those who need a cheaper version of Viagra. You can buy Viagra online at excellent prices, and you can even find offers and discounts online as well.

  16. It is definitely easier to find out informative tidbits on the erectile dysfunction drug Viagra by inserting the keyword “Viagra” in the Google search tool bar. You can also log into theResources section of the website, and obtain comprehensive Viagra information.

  17. If you are in the grip of erectile dysfunction, you can treat the disorder effectively by taking the anti-impotence drug Levitra in accordance with the doctor’s instructions but it is altogether a fallacy to assume that Levitra is capable of providing you immediate erections. Get in touch with the website and you would get to know that after taking Levitra, the medicine for treating erectile dysfunction, you need to be sexually stimulated to achieve erections necessary for satisfactory sexual intercourse.

  18. A thoroughly entertaining tale on erectile dysfunction and medicines to treat erectile dysfunction such as Viagra, Cialis and Levitra is available for you at

  19. Great site about "PHP 5 Adoption has Tipped!" ,this information really helped me , I really appreciate it,I will visit when ever i have found the stuff That i have been searching for in all the web for, keep up the great work!

  20. Erectile dysfunction can be caused by any number of physical and psychological factors. In general, erectile dysfunction is classified according to whether it is caused by organic (caused by a bodily organ or organ system) or psychogenic (mental) factors. Diseases, nutritional status, trauma, surgical procedures, or medications can affect erectile function by altering the nervous, vascular, or hormonal systems. Some men have more than one cause for their erectile dysfunction.

    It can be treated safely by generic viagra medication.
    buy zenegra online

  21. Hey, nice site you have here! Keep up the excellent work!

    doctors online

  22. Hello.. Firstly I would like to send greetings to all readers. After this, I recognize the content so interesting about this article. For me personally I liked all the information. I would like to know of cases like this more often. In my personal experience I might mention a book called Firesales Costa Rica in this book that I mentioned have very interesting topics, and also you have much to do with the main theme of this article.

  23. This comment has been removed by the author.

  24. Buy Viagra at low price is discount online pharmacy offering Viagra online forless. Our viagra online pharmacy is internet's leading online pharmacy at affordable at affordable discount prices.

  25. it is just great, I knew many were waiting for PHP 5.1 before upgrading, its release in last November seems to have created a huge increase in PHP 5 adoption. In July over 74% of support tickets were by customers using PHP 5 (and remember we do support both versions).

  26. I always the big fan of your blog.Your blog always contains a great information.They are always useful for me and resourceful also.Please keep such kind of the information in the future also!!!!!
    Generic Viagra

  27. GREAT post. I found this as I was writing an article, albeit from a different viewpoint, about the same thing-

    Medical Mirror
    Medical Stethoscopes and Sphygmomanometers
    Electronic Cigarette
    Stark Hand
    Antiseptic 1847

  28. Hi, probably our entry may be off topic but anyways, I have been surfing around your blog and it looks very professional. It’s obvious you know your topic and you

    appear fervent about it. I’m developing a fresh blog plus I’m struggling to make it look good, as well as offer the best quality content. I have learned much at your

    web site and also I anticipate alot more articles and will be coming back soon. Thanks you.

    PHP Course in Chennai

  29. Thanks for sharing so interesting article with us. I agree with your idea completely. I am looking forward to another great article from you.
    Advertising agencies in Karachi | Advertising agencies in Pakistan