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YII::app () ->request->getUrl () method is used to GET current url in Yii FRAMEWORK.

Yii::app () ->request->getUrl () method is used to get current url in Yii framework.

Render FUNCTION is used to render a VIEW in YII with specified layout whereas render partial is used to render only view layout is not INCLUDED in view.

RenderPartial is basically used when we have to update a portion of page via AJAX.

Usage

Render ('yourviewname');

RenderPartial ('yourviewpartial');

Render function is used to render a view in Yii with specified layout whereas render partial is used to render only view layout is not included in view.

RenderPartial is basically used when we have to update a portion of page via AJAX.

Usage

Render ('yourviewname');

RenderPartial ('yourviewpartial');

Active Record provides an object-oriented INTERFACE for accessing and manipulating DATA stored in databases. An Active Record class is associated with a database table, an Active Record instance CORRESPONDS to a row of that table, and an ATTRIBUTE of an Active Record instance represents the value of a particular column in that row. Instead of writing raw SQL statements, you would access Active Record ATTRIBUTES and call Active Record methods to access and manipulate the data stored in database tables.

Active Record provides an object-oriented interface for accessing and manipulating data stored in databases. An Active Record class is associated with a database table, an Active Record instance corresponds to a row of that table, and an attribute of an Active Record instance represents the value of a particular column in that row. Instead of writing raw SQL statements, you would access Active Record attributes and call Active Record methods to access and manipulate the data stored in database tables.

Yii C MODEL is the base class that provides the common features NEEDED by data model objects. C Model defines the basic FRAMEWORK for data MODELS that need to be validated. All Models in Yii extends C Model class.

Yii C Model is the base class that provides the common features needed by data model objects. C Model defines the basic framework for data models that need to be validated. All Models in Yii extends C Model class.

• Like most PHP frameworks, YII implements the MVC (Model-View-Controller) architectural pattern and promotes CODE organization based on that pattern.
• Yii takes the philosophy that code should be written in a simple yet elegant way. Yii will never try to over-design things mainly for the purpose of strictly following some design pattern.
• Yii is a full-stack framework providing MANY proven and ready-to-use features: query builders and ActiveRecord for both relational and NoSQL databases; RESTful API development support; multi-tier caching support; and more.
• Yii is extremely extensible. You can customize or REPLACE nearly every piece of the core’s code. You can also take advantage of Yii’s solid extension architecture to use or develop redistributable EXTENSIONS.
• High performance is always a primary goal of Yii.
• Larger Community.

Components are an independent set of CODE written to perform specific TASK in controllers.Yii applications are built UPON components which are objects written to a specification. A component is an instance of Component or its derived class. Using a component mainly involves accessing its PROPERTIES and raising/handling its events. The base class Component specifies how to define properties and events.

Components are an independent set of code written to perform specific task in controllers.Yii applications are built upon components which are objects written to a specification. A component is an instance of Component or its derived class. Using a component mainly involves accessing its properties and raising/handling its events. The base class Component specifies how to define properties and events.

FORMATTER is Yii application COMPONENT that is used format view data in readable format for users. By default the formatter is implemented by Yiii18nFormatter which provides a set of methods to format data as date/time, numbers, currencies, and other commonly used formats. You can use the formatter LIKE the following,

$formatter = Yii::$app->formatter;

// output: January 1, 2014

echo $formatter->asDate('2014-01-01', 'long');

 // output: 12.50%

echo $formatter->asPercent(0.125, 2);

 // output: cebe@example.com

echo $formatter->asEmail('cebe@example.com'); 

// output: Yes

echo $formatter->asBoolean(true); 

// it also handles display of null VALUES:

// output: (not set)

echo $formatter->asDate(null);

Formatter is Yii application component that is used format view data in readable format for users. By default the formatter is implemented by Yiii18nFormatter which provides a set of methods to format data as date/time, numbers, currencies, and other commonly used formats. You can use the formatter like the following,

$formatter = Yii::$app->formatter;

// output: January 1, 2014

echo $formatter->asDate('2014-01-01', 'long');

 // output: 12.50%

echo $formatter->asPercent(0.125, 2);

 // output: cebe@example.com

echo $formatter->asEmail('cebe@example.com'); 

// output: Yes

echo $formatter->asBoolean(true); 

// it also handles display of null values:

// output: (not set)

echo $formatter->asDate(null);

Helpers are static classes in Yii that simplify common coding tasks, such as string or array manipulations, HTML code GENERATION, and so on. In Yii all helpers are KEPT under yii helpers NAMESPACE.

You use a HELPER class in Yii by directly calling one of its static methods, like the following:

use yii helpers Html;

echo Html::encode('TEST > test');

Helpers are static classes in Yii that simplify common coding tasks, such as string or array manipulations, HTML code generation, and so on. In Yii all helpers are kept under yii helpers namespace.

You use a helper class in Yii by directly calling one of its static methods, like the following:

use yii helpers Html;

echo Html::encode('Test > test');

When handling a user request, YII 2.0 application will undergo the following stages:

1. Pre-initialize the application with Application::preinit ();
2. Set up the error handling;
3. Register core application COMPONENTS;
4. Load application CONFIGURATION;
5. Initialize the application with Application::INIT()

• Register application behaviors;
• Load static application components;

6 Raise an onBeginRequest event;
7. Process the user request.

• Collect information about the request;
• Create a controller;
• Run the controller;

8. Raise an onEndRequest event;

When handling a user request, Yii 2.0 application will undergo the following stages:

1. Pre-initialize the application with Application::preinit ();
2. Set up the error handling;
3. Register core application components;
4. Load application configuration;
5. Initialize the application with Application::init()

6 Raise an onBeginRequest event;
7. Process the user request.

8. Raise an onEndRequest event;

Yii follows below naming conventions:

• You can define table PREFIX when using Gii. In your case, you need to set it to tbl_. Then it should generate User Controller instead of TblUserController.
• The Yii Framework employs a class naming convention WHEREBY the names of the classes directly map to the directories in which they are stored. The ROOT level directory of the Yii Framework is the “framework/” directory, under which all classes are stored hierarchically.
• Class names MAY only contain alphanumeric characters. Numbers are permitted in class names but are discouraged. Dot (.) is only permitted in place of the path separator.

Yii follows below naming conventions:

Index.php is first FILE that is called Yii framework starts. In turn it will create a new OBJECT of new YiiwebApplication and start the application.

require(__DIR__ . '/../vendor/autoload.php');

require(__DIR__ . '/../vendor/yiisoft/yii2/Yii.php');

// load application configuration

$CONFIG = require(__DIR__ . '/../config/web.php');

// instantiate and configure the application

(new yiiwebApplication($config))->RUN();

Index.php is first file that is called Yii framework starts. In turn it will create a new object of new YiiwebApplication and start the application.

require(__DIR__ . '/../vendor/autoload.php');

require(__DIR__ . '/../vendor/yiisoft/yii2/Yii.php');

// load application configuration

$config = require(__DIR__ . '/../config/web.php');

// instantiate and configure the application

(new yiiwebApplication($config))->run();

GII is module powerful module provided by Yii framework. It helps you create and generate FULLY customized forms, models, CRUD for database and more. You can enable Gii by configuring it in the modules property of the APPLICATION. Depending upon how you created your application,

you may find the following code is already provided in the config/web.php CONFIGURATION file:

$config = [ ... ];

if (YII ENV DEV) {

$config['bootstrap'][] = 'gii';

$config['modules']['gii'] = [

'class' => 'yii Module',

];

}

Gii is module powerful module provided by Yii framework. It helps you create and generate fully customized forms, models, CRUD for database and more. You can enable Gii by configuring it in the modules property of the application. Depending upon how you created your application,

you may find the following code is already provided in the config/web.php configuration file:

$config = [ ... ];

if (YII ENV DEV) {

$config['bootstrap'][] = 'gii';

$config['modules']['gii'] = [

'class' => 'yii Module',

];

}

YII 2 REQUIRES PHP 5.4 or above with Mbstring EXTENSION and PCRE-support.

Yii 2 requires PHP 5.4 or above with Mbstring extension and PCRE-support.

Below are LIST of some database related functions used in Yii 2 Framework

find(): Creates an yii dbActive QueryInterface instance for query purpose.

Usages:

//Getting first record matching with condition

$user = User::find()->where(['name' => 'Abc'])->one();

Find All(): Returns a list of active record models that match the specified primary key value(s) or a set of column values.

Usages:

// find the CUSTOMERS whose primary key value is 10

$customers = Customer::find All (10);

// find customers whose age is 30 and whose status is active

$customers = Customer::find All (['age' => 30, 'status' => 'active']);

INSERT (): Inserts a row into the associated database table using the attribute values of this record.

Usages:

$customer = new Customer;

$customer->name = $name;

$customer->email = $email;

$customer->insert();

Delete(): Deletes the table row corresponding to this active record.

Usages:

$models = Customer::find()->where('status = 3')->all();

foreach ($models as $model) {

$model->delete();

}

Delete All(): Deletes rows in the table using the provided conditions.

Usages:

Customer::delete All ('status = 3');

save() :SAVES the current record. Usages:

$customer = new Customer; // or $customer = Customer::find One ($id);

$customer->name = $name;

$customer->email = $email;

$customer->save();

Below are list of some database related functions used in Yii 2 Framework

find(): Creates an yii dbActive QueryInterface instance for query purpose.

Usages:

//Getting first record matching with condition

$user = User::find()->where(['name' => 'Abc'])->one();

Find All(): Returns a list of active record models that match the specified primary key value(s) or a set of column values.

Usages:

// find the customers whose primary key value is 10

$customers = Customer::find All (10);

// find customers whose age is 30 and whose status is active

$customers = Customer::find All (['age' => 30, 'status' => 'active']);

Insert (): Inserts a row into the associated database table using the attribute values of this record.

Usages:

$customer = new Customer;

$customer->name = $name;

$customer->email = $email;

$customer->insert();

Delete(): Deletes the table row corresponding to this active record.

Usages:

$models = Customer::find()->where('status = 3')->all();

foreach ($models as $model) {

$model->delete();

}

Delete All(): Deletes rows in the table using the provided conditions.

Usages:

Customer::delete All ('status = 3');

save() :Saves the current record. Usages:

$customer = new Customer; // or $customer = Customer::find One ($id);

$customer->name = $name;

$customer->email = $email;

$customer->save();

Features of Yii Framework:

• Model-View-Controller (MVC) design pattern
• Form input and validation
• Skinning and theming mechanism
• Layered caching scheme
• Unit and functionality testing
• Automatic code generation
• Error handling and logging
• Database Access Objects (DAO), QUERY Builder, ACTIVE Record, DB Migration
• AJAX-enabled WIDGETS
• Internationalization and localization
• Authentication and authorization
• Extension library
• Detailed documentation

Features of Yii Framework:

You can INSTALL Yii2 by running below COMMANDS via composer:

Composer global REQUIRE "fxp/composer-asset-plugin:^1.3.1"

Composer create-project --prefer-dist yiisoft/yii2-app-BASIC basic

You can install Yii2 by running below commands via composer:

Composer global require "fxp/composer-asset-plugin:^1.3.1"

Composer create-project --prefer-dist yiisoft/yii2-app-basic basic

The LATEST VERSION of YII 2 is 2.0.12, released on June 5, 2017.

The latest version of Yii 2 is 2.0.12, released on June 5, 2017.

Yii 2.0 requires PHP 5.4.0 or above and RUNS BEST with the latest version of PHP 7 too.

Yii 2.0 requires PHP 5.4.0 or above and runs best with the latest version of PHP 7 too.

Yii 2 is one of the most popular Web PROGRAMMING FRAMEWORK written in PHP language.It can be used for developing all kinds of Web applications from BLOGS to e-commerce websites and ERP’s. Yii implements the MVC (Model-View-Controller) architectural pattern.

Yii 2 is one of the most popular Web programming framework written in PHP language.It can be used for developing all kinds of Web applications from blogs to e-commerce websites and ERP’s. Yii implements the MVC (Model-View-Controller) architectural pattern.