Monthly Archives: January 2009

Strange issue with captcha field

Captcha caseWell, it’s more an observation than a real problem.

For my current CakePHP project I had to set a captcha field to a user registration form. I decided to be “creative” and I set the captcha image as background of the input field. In fact the graphical representation wasn’t bad at all. Unfortunately when it’s used, the captcha word shows wrong image and of course the result was wrong. To be correct the first attempt was always ok, but the second one (let’s say if the user decided to register again) the captcha was always wrong.

I checked everything especially after the image in Javascript library case and I couldn’t find anything suspicious.

The solution came when I removed the image from the background of the field and call it with an <img> tag. This time everything went just fine. This make me think that it’s a cache problem. I didn’t dig it deeply, because for now it’s working and as you can see it’s looking better.

So, an advise from me – never put your captcha image as background of your field, or call through css. Just use good old <img> tag instead.

Book review: CakePHP Application Development

CakePHP Application Development

In the beginning of December I’ve been asked to write a review of a book called CakePHP Application Development. The interesting thing was that I received a copy of the book exactly on my birthday – 29-th of December (probably consequence, but it was really nice). In this article I will write about what this book covers and my opinion of the content. Hope it will be a good guide for these of you who will decide to buy a copy of it from

What this book covers

First two chapters start with some theoretical explanations about concepts and patterns which are used in the Framework as well as the process of installation of the framework.

The next chapter explain how to build a really simple application. The readers could use to with the framework way of coding, everything in this chapter is hand crafted, so people could actually see how it’s works.

After this there are 4 chapters which explain in details how the Models, Controllers and Views are working in details.

There is one chapter which explain how to build an scaffolded application with the Bake console script. There is an explanation how to create Models, Controllers and Views.

The next chapters explain how to build a real world example with CakePHP called Quickwall (Questions and Answers), which is different from standard blog creation example. In these chapters the authors upgrade and optimize the app and expand it’s functionality, so at the end it could be used in the real world.

The good things

  • Even though it’s really difficult to write for a framework which still is in development, where some coding conventions could be changed, this book cover almost everything which is currently used in CakePHP1.2
  • The book is build with example driven approach which is really helpful for understanding from the developers
  • Each article is separated in sensible 3 sub-sections: introduction, or theoretical part, Time for action and What Just Happened. This approach is really useful, because first, explained what will be done in the current chapter, the second part display the actual code snippets and the third one explain step by step the code presented in the previous part. For me it’s really good approach of writing a technical book
  • Using non trivial building a blog is also a plus, I personally don’t think that anyone will write a new blog platform, just because for fun. The Quickwall application could be used in real world without any problems.

What I didn’t like

  • It’s opposite of the first thing in the previous list – just because the framework in still in motion the book is jist a little bit outdated. There are few code snippets where I found that for example condition word is in the right part, while at this moment it’s moved to the left. The code in the book was:
    'conditions' => array('ModelName.field_name' => 'LIKE value')

    while it should be

    'conditions' => array('ModelName.field_name LIKE' => 'value')
  • There are some things which are missing although they are well known – the behaviors. The same as the authors explained about the components and helpers, they should take a moment and explain the behaviors as well. In fact this is totally missing in this book.
  • Although the validations are well explained in the book, I miss the list of methods provided from the core.
  • There isn’t any information about the internationalization, which for me as developer working with many people and different languages is essential.

The conclusion

I would recommend this book for PHP developers who are new to the framework and they are willing to understand the core functionality of it. With the good approach of introduction-code-explanation, it will be really easy to learn how to use the CakePHP. This book could build a base, but it cannot create from you an advanced CakePHP developer (well I think it’s not the main purpose of it anyway). The learning is ongoing process and people which are willing to learn could start with this book, but after this, they need to continue reading other materials, as well as start with real development tasks, because the practice is the best teacher invented ever.

Here is a sample chapter from the book kindly provided from Pakt Publishing

Reviews by others: