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Books for professionals by professionals ®

The EXPERT’s VOIce ® in Web Development
Companion
eBook Available

From Novice to Professional
Dear Reader,
Rapid development frameworks surfaced not long ago, finally bringing to the
web development world the effective tools other software systems have enjoyed
for a long time. If you are like me, you can probably recall poring over all the
online documentation you could find trying to learn these new methods for
building web sites, only to find they all required that you learn another programming language with which you hadn’t previously worked. Or you probably
found several dead ends where the tutorials or terminology confused you.
As web frameworks became increasingly popular, what I wanted was a
framework in PHP, the language I had already learned and loved, that could
deliver all that I was reading about in these other platforms. And I wanted
someone to tell me in simple terms how and where to start. I found CakePHP—
the most robust, cleanest, well-designed PHP framework available—and now
building web sites has never been better.
This book provides you with a good start to CakePHP. You will learn where
to begin, what tools Cake provides, and how to rapidly write methods into your
application. Cake comes with an impressive collection of helper functions and
core methods that make data handling, form processing, Ajax request handling,

CakePHP Projects

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ISBN 978-1-4302-0977-5
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US $42.99

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David Golding

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PART 1

■■■

Getting Started

■CHAPTER 2
■CHAPTER 3

Installing and Running CakePHP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Creating a To-Do List Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

PART 2

Developing CakePHP Applications

■CHAPTER
■CHAPTER
■CHAPTER
■CHAPTER
■CHAPTER

PART 3
■CHAPTER
■CHAPTER
■CHAPTER
■CHAPTER
■CHAPTER
■CHAPTER
■CHAPTER

Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Components and Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Vendors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Plugins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
DataSources and Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Wrapping Up the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273


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■■■

■APPENDIX A
■APPENDIX B

Page v

Appendixes

Installation Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
How CakePHP Compares with Other Frameworks . . . . . . . . . . . . . . 289

■INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295


It’s PHP! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rapid Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Model-View-Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
CRUD Operations and the Bake Script . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Scaffolding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Helpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Customizable Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Large Community . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
More Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

PART 1

■■■

■CHAPTER 2

Getting Started

Installing and Running CakePHP. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
A Simple Start: Running Cake on a Localhost Environment. . . . . . . . . . . . . 9
Getting Cake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Launching Cake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Running the Setup Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Preparing the tmp Folder for Cake to Read and
Write Temp Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Changing the Security.salt Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Entering MySQL Connection Settings . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Designing Your Database Schema . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

PART 2

■■■

■CHAPTER 4

Developing CakePHP Applications

Naming Files and Designing the Database . . . . . . . . . . . . . . . . 29
Convention Over Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Intercepting Cake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Starting with the Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
MVC Default Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Naming Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Naming Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Naming Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Naming Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
More Than One Word in the Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Naming Other Cake Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Best Practices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Poorly Designed Databases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Why Good Database Design Matters . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Feature Creep and Cake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40


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Considering Internationalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Using Commands for Faster Baking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Customizing Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

■CHAPTER 6

Customizing Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Handling User Interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
A Simple Page Request. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
A Form Submission Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Filling Form Fields for Editing or Updating. . . . . . . . . . . . . . . . . . . . . . 78
An Asynchronous Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Writing Individual View Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Using the Debug Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Customizing the View File from Scratch . . . . . . . . . . . . . . . . . . . . . . . 83
Customizing an HTML Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Using Other Helpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

ix


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Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

■CHAPTER 8

Implementing Ajax Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
How Ajax Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Working with Ajax Frameworks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Using the Ajax Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Preparing the Ajax Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Installing Prototype . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Including the JavaScript Helper in the App Controller File . . . . . . . 116
Making Helpers Available for the Whole Application . . . . . . . . . . . . 117
Adding Comments to the Blog. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Working Ajax into the View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Displaying Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Using an Ajax Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120


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■CONTENTS

Working Ajax into the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Rendering for Ajax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

The Ajax Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
The JavaScript Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
The Number Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
The Paginator Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
The RSS Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
The Session Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
The Text Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
The Time Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
The XML Helper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

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■CONTENTS

Creating Custom Helpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Using the App Helper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Creating the Helper File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Using Outside Helper Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Making a Helper for Your Blog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Other Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198


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■CONTENTS

Utility Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
Configure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
File and Folder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
HTTP Socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Localization and Internationalization . . . . . . . . . . . . . . . . . . . . . . . . . 202
Sanitize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Third-Party Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Creating Custom Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Using the Initialize and Startup Functions . . . . . . . . . . . . . . . . . . . . . 205
Writing Vendor Files Instead of Components . . . . . . . . . . . . . . . . . . 206
Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

■CHAPTER 12 Vendors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Using Vendors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Dealing with File Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Dealing with Nested Folders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Making No Assumptions for Third-Party Scripts . . . . . . . . . . . . . . . . . . . . 209


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■CONTENTS

■CHAPTER 14 DataSources and Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Extending the Model with DataSources and Behaviors . . . . . . . . . . . . . . 243
Working with DataSources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Using Built-in DataSources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
Building a Custom DataSource . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Working with Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Using the Tree Behavior to Categorize Blog Posts . . . . . . . . . . . . . . 255
Using Other Tree Behavior Functions . . . . . . . . . . . . . . . . . . . . . . . . . 263
Using the ACL and Translate Behaviors . . . . . . . . . . . . . . . . . . . . . . . 265
Using the Containable Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
Attaching and Detaching Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . 267
Writing Custom Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270

■CHAPTER 15 Wrapping Up the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Designing the Home Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Using the Pages Controller to Produce a Single View . . . . . . . . . . . 273
Making an Action the Starting Point . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Generating Dynamic Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Customizing the Overall Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Debugging the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Running the Application on a Remote Host. . . . . . . . . . . . . . . . . . . . . . . . . 277
Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278


■APPENDIX B

How CakePHP Compares with Other Frameworks . . . . . . . 289
PHP Frameworks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Using the Various Frameworks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
CakePHP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
CodeIgniter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Symfony. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Zend Framework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

■INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295

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Would Seth Godin Do plugin.

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Acknowledgments
I

owe much to those who have contributed to this book, especially since CakePHP
is an improving framework and its online community is growing. Chris Nielsen and
Benjamin Swanson directed me in which web frameworks to consider and how to
build more robust web sites, for which I’m grateful. Steven Burton, Julie Cloward, and
Richard Culatta at Brigham Young University provided the opportunities and support
to explore web development and to teach others; your influence also contributed to my
personal skill set, for which I’ll always be thankful. Spencer Fluhman, in so many ways,
has been a brilliant mentor and advisor; thank you for your professional counsel and
support. Richard Miller’s technical expertise and reviews made this book so much
more solid, not to mention the professional skills that helped tighten up the loose
ends. I wish to thank the Cake Software Foundation and other dedicated Cake developers for providing not only an exceptional framework but for taking the time to judiciously design an effective paradigm for web development. Felix Geisendörfer, Daniel
Hofstetter, Tom O’Reilly, and Garrett J. Woodworth have all been especially helpful in
providing examples and documentation that facilitated the writing of this book. And,
most especially, the staff members at Apress have been remarkable; thank you for taking this book to the next level.

project, be it web-related or not, is explained by the concept of “inversion of control.” Many
programs operate in such a way that the code is in control. In other words, the code decides
when one operation should appear, how it should handle the user’s response, and so forth.
Imagine if this order of control were inverted. Rather than have a script or library that contains
a series of operations, the program has a series of objects that can do nothing until you extend
them (even though they may contain tons of tools you could put to use). In this way, the
framework calls on you, not the other way around.
For example, let’s say you are looking for a way to install a voting program into your web
site. You browse the Internet and find a handful of useful PHP scripts that all promise to do
that for you. After plugging in some unique settings, you place one of these scripts onto your
server and launch the program. The program runs just fine, but if you wanted to change anything, you would have to go into the script, locate where the operation occurs that you want to
change, and work the adjustment by hand. The script manages the flow of control in the sense
that all of its operations are executed when the program runs, and if you want to control the
program, you have to alter the script.
A framework, on the other hand, has an inverted flow of control. To produce a voting
application in a framework, you would have to add to the framework those objects that would
handle the voting. The framework would automatically pull together several resources to
make the voting process happen, and you would have to intercept those resources or extend
them to add your own functionality. A library will behave on its own, like the script example,
and any changes must be made directly in the code. A framework is different in that it will wait
for you to extend or add to it before it can really do anything for you. You will not need to go
directly to the framework’s code to make changes; instead, the framework will take your extensions and use those instead of its own libraries.
CakePHP (or, for short, Cake) is a framework, not a set of libraries, even though it contains
dozens of functions and methods that simplify web development much like libraries do. As
such, Cake waits on you to extend its objects and add your own customized resources. With
Cake, gone are the days of individually scripting each and every function. Instead, developers
are using a bundled package of scripts, libraries, and conventions that are designed specifically for web development.

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and will provide some detailed code samples and visual snapshots to walk you through the
process. In Chapter 2, I’ll show how to build a simple Cake application. You’ll get used to the
Model-View-Controller (MVC) structure and how to organize your Cake applications effectively. In Part 2, you’ll build more extensive web applications in Cake, and you’ll explore Cake’s
built-in helpers, including the Ajax helper, and work with more advanced features. By the end
of the book, you will be able to create your own helpers, plugins, and other useful features that
will reduce the overall amount of code to run your applications, and you’ll also have a solid
enough foundation to try other advanced features on your own.

Why Cake?
Ever since Ruby on Rails became a popular web-based framework, teams of developers have
been creating clones of Rails or Rails-like frameworks for various languages: TurboGears for
Python; Zend, Symfony, and many others for PHP; Catalyst for Perl; and on and on. With so
many options out there, why choose CakePHP for your web project?

It’s PHP!
Many web developers complain about switching to Ruby on Rails simply because the framework is built on the Ruby language. PHP, they say, is one of the more widely supported web
programming languages and is standard with most web services providers, so why give that
up for Ruby? For those who learned web development on PHP or those who have made PHP
their primary development tool, the idea of ditching PHP for something else may seem
daunting or time-consuming. For companies, switching to another language can require
reallocating resources, changing web service providers, or reworking an expensive server
configuration. Whatever the case, leaving PHP for another development framework can be
costly and time-consuming. With Cake, you can enjoy the benefits of framework-based
development without learning another language.


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Cake enforces an MVC structure for your web applications. Basically, it effectively separates
typical operations into specific areas: models for all your database interaction, views for all
your output and displays, and controllers for all your commands/scripts for input and program flow. The typical PHP application mixes each of these three functions in the same code,
making it difficult to maintain and debug.
This is the typical flow for PHP scripting (see Figure 1-1):
1. The client sends a request to a PHP script by typing a URL or clicking a link of some
kind.
2. The script processes the data and then sends the database requests directly to the
database.
3. The script receives any database output and processes the data.
4. The script generates output and forwards it to the client’s browser.

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