Yii2 Application Development Cookbook

Yii2 Application Development Cookbook - Third Edition

By : Sergey Ivanov, Andrew Bogdanov, Dmitry Eliseev

Buy this Book

Yii2 Application Development Cookbook - Third Edition

By: Sergey Ivanov, Andrew Bogdanov, Dmitry Eliseev

Buy this Book

Overview of this book

Yii is a free, open source web application development framework written in PHP5 that promotes clean DRY design and encourages rapid development. It works to streamline your application development time and helps to ensure an extremely efficient, extensible, and maintainable end product. Being extremely performance optimized, Yii is a perfect choice for any size project. However, it has been built with sophisticated, enterprise applications in mind. You have full control over the configuration from head-to-toe (presentation-to-persistence) to conform to your enterprise development guidelines. It comes packaged with tools to help test and debug your application, and has clear and comprehensive documentation. This book is a collection of Yii2 recipes. Each recipe is represented as a full and independent item, which showcases solutions from real web-applications. So you can easily reproduce them in your environment and learn Yii2 fast and without tears. All recipes are explained with step-by-step code examples and clear screenshots. Yii2 is like a suit that looks great off the rack, but is also very easy to tailor to fit your needs. Virtually every component of the framework is extensible. This book will show how to use official extensions, extend any component, or write a new one. This book will help you create modern web applications quickly, and make sure they perform well using examples and business logic from real life. You will deal with the Yii command line, migrations, and assets. You will learn about role-based access, security, and deployment. We’ll show you how to easily get started, configure your environment, and be ready to write web applications efficiently and quickly.

Yii2 Application Development Cookbook Third Edition

Credits

About the Authors

About the Reviewer

www.PacktPub.com

Preface

Free Chapter

Fundamentals

Introduction

Installing the framework

Application templates

Dependency injection container

Service locator

Code generation

Configuring components

Working with events

Using external code

Routing, Controllers, and Views

Introduction

Configuring URL rules

Generating URLs

Using regular expressions in URL rules

Using a base controller

Using standalone actions

Creating a custom filter

Displaying static pages

Using flash messages

Using the controller context in a view

Reusing views with partials

Using blocks

Using decorators

Defining multiple layouts

Pagination and sorting data

ActiveRecord, Model, and Database

Introduction

Getting data from a database

Defining and using multiple DB connections

Customizing the ActiveQuery class

Processing model fields with AR event-like methods

Automating timestamps

Setting up an author automatically

Setting up a slug automatically

Transactions

Replication and read-write splitting

Implementing single table inheritance

Forms

Introduction

Writing your own validators

Uploading files

Adding and customizing CaptchaWidget

Customizing Captcha

Creating a custom input widget

Tabular input

Conditional validation

Complex forms with multiple models

AJAX-dependent drop-down list

AJAX validation

Creating a custom client-side validation

Security

Introduction

Authentication

Using controller filters

Preventing XSS

Preventing SQL injections

Preventing CSRF

Using RBAC

Encrypting/Decrypting data

RESTful Web Services

Introduction

Creating a REST server

Official Extensions

Authentication client

SwiftMailer e-mail library

Faker fixture data generator

Imagine library

MongoDB driver

ElasticSearch engine adapter

Gii code generator

Pjax jQuery plugin

Redis database driver

Extending Yii

Introduction

Creating helpers

Creating model behaviors

Creating components

Creating reusable controller actions

Creating reusable controllers

Creating a widget

Creating CLI commands

Creating filters

Creating modules

Creating a custom view renderer

Creating a multilanguage application

Making extensions distribution-ready

Performance Tuning

Following best practices

Speeding up session handling

Using cache dependencies and chains

Profiling an application with Yii

Leveraging HTTP caching

Combining and minimizing assets

Running Yii2 on HHVM

Deployment

Introduction

Changing the Yii directory layout

Moving an application webroot

Changing an advanced application template

Moving configuration parts into separate files

Using multiple configurations to simplify the deployment

Implementing and executing cron jobs

Maintenance mode

Deployment tools

Testing

Introduction

Testing application with Codeception

Unit testing with PHPUnit

Unit testing with Atoum

Unit testing with Behat

Debugging, Logging, and Error Handling

Introduction

Using different log routes

Analyzing the Yii error stack trace

Logging and using the context information

Displaying custom errors

Custom panel for debug extension

Index

Customer Reviews

5 star

4 star

3 star

2 star

1 star

Configuring components

Yii is a very customizable framework. Moreover, as in all customizable code, there should be a convenient way to set up different application parts. In Yii, this is provided through configuration files located at config.

Getting ready

Create a new application by using the Composer package manager as described in the official guide at http://www.yiiframework.com/doc-2.0/guide-startinstallation.html.

How to do it…

If you have worked with Yii before, then you have probably configured a database connection:

return [
    …
    'components' => [
        'db' => [
            'class' => 'system.db.CDbConnection',
            'dsn' => 'mysql:host=localhost;dbname=database_name',
            'username' => 'root',
            'password' => '',
            'charset' => 'utf8',
        ],
        …
    ],
    …
];

This way of configuring components is used when you want to use a component across all application parts. With the preceding configuration, you can access a component by its name, such as Yii::$app->db.

How it works…

When you are using the Yii::$app->db component for the first time directly or through an Active Record model, Yii creates a component and initializes its public properties with the corresponding values provided in db array under the components section of the application configuration file. In the preceding code, dsn value will be assigned to yii\db\Connection::dsn, username will be assigned to Connection::username, and so on.

If you want to find out what charset stands for or want to know what else you can configure in the db component, then you need to know its class. In the case of the db component, the class is yii\db\Connection. You can just open the class and look for its public properties, which you can set from config.

In the preceding code, the class property is a bit special because it is used to specify the component class name. It does not exist in the yii\db\Connection class. Therefore, it can be used to override a class as follows:

return [
    …
    'components' => [
        'db' => [
            'class' => app\components\MyConnection',
            …
        ],
        …
    ],
     …
);

This way, you can override each application component; this is very useful whenever a standard component does not fit your application.

Built-in components

Now, let's find out which standard Yii application components you can configure. There are two application types bundled with Yii:

Web application (yii\webApplication)
Console application (yii\console\Application)

Both are extended from yii\base\Application, so both console and web applications share its components.

You can get the component names from the source code of the coreComponents() application's method.

You can add your own application components (classes extended from yii\base\Component) by simply adding new configuration items and pointing their class properties to your custom classes.

Yii2 Application Development Cookbook - Third Edition

By : Sergey Ivanov, Andrew Bogdanov, Dmitry Eliseev

Yii2 Application Development Cookbook - Third Edition

By: Sergey Ivanov, Andrew Bogdanov, Dmitry Eliseev

Overview of this book

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Current Title:

Yii2 Application Development Cookbook - Third Edition

Configuring components

Getting ready

How to do it…

How it works…

Built-in components

See also