<?php

defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');

// register Composer autoloader
require __DIR__ . '/../vendor/autoload.php';

// include Yii class file
require __DIR__ . '/../vendor/yiisoft/yii2/Yii.php';

// load application configuration
$config = require __DIR__ . '/../config/web.php';

// create, configure and run application
(new yii\web\Application($config))->run();

#!/usr/bin/env php
<?php
/**
 * Yii console bootstrap file.
 *
 * @link https://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license https://www.yiiframework.com/license/
 */

defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');

// register Composer autoloader
require __DIR__ . '/vendor/autoload.php';

// include Yii class file
require __DIR__ . '/vendor/yiisoft/yii2/Yii.php';

// load application configuration
$config = require __DIR__ . '/config/console.php';

$application = new yii\console\Application($config);
$exitCode = $application->run();
exit($exitCode);

defined('YII_DEBUG') or define('YII_DEBUG', true);

if (!defined('YII_DEBUG')) {
    define('YII_DEBUG', true);
}

composer global require "fxp/composer-asset-plugin:^1.3.1"  
composer create-project --prefer-dist yiisoft/yii2-app-basic basic  

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 yii\web\Application($config))->run();

\Yii::$app->componentID

[
    'components' => [
        // register "cache" component using a class name
        'cache' => 'yii\caching\ApcCache',

        // register "db" component using a configuration array
        'db' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=demo',
            'username' => 'root',
            'password' => '',
        ],

        // register "search" component using an anonymous function
        'search' => function () {
            return new app\components\SolrService;
        },
    ],
]

use yii\helpers\Html;  
echo Html::encode('Test > test'); 

$formatter = \Yii::$app->formatter;  
  
// output: January 1, 2021  
echo $formatter->asDate('2021-01-01', 'long');  
   
// output: 12.50%  
echo $formatter->asPercent(0.125, 2);  
   
// output: jtp@example.com  
echo $formatter->asEmail('jtp@example.com');   
  
// output: Yes  
echo $formatter->asBoolean(true);   
// it also handles display of null values:  
  
// output: (not set)  
echo $formatter->asDate(null);

namespace app\components;

use Yii;
use yii\base\ActionFilter;

class ActionTimeFilter extends ActionFilter
{
    private $_startTime;

    public function beforeAction($action)
    {
        $this->_startTime = microtime(true);
        return parent::beforeAction($action);
    }

    public function afterAction($action, $result)
    {
        $time = microtime(true) - $this->_startTime;
        Yii::debug("Action '{$action->uniqueId}' spent $time second.");
        return parent::afterAction($action, $result);
    }
}

<?php
use yii\jui\DatePicker;
?>
<?= DatePicker::widget(['name' => 'date']) ?>

<?php
use yii\jui\DatePicker;
?>
<?= DatePicker::widget([
    'model' => $model,
    'attribute' => 'from_date',
    'language' => 'ru',
    'dateFormat' => 'php:Y-m-d',
]) ?>

<?php
use yii\widgets\ActiveForm;
use yii\helpers\Html;
?>

<?php $form = ActiveForm::begin(['id' => 'login-form']); ?>

    <?= $form->field($model, 'username') ?>

    <?= $form->field($model, 'password')->passwordInput() ?>

    <div class="form-group">
        <?= Html::submitButton('Login') ?>
    </div>

<?php ActiveForm::end(); ?>

\Yii::$container->set('yii\widgets\LinkPager', ['maxButtonCount' => 5]);

$config = [ ... ];  
  
if (YII_ENV_DEV) {  
    $config['bootstrap'][] = 'gii';  
    $config['modules']['gii'] = [  
        'class' => 'yii\gii\Module',  
    ];  
} ​

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 yii\web\Application($config))->run(); ​

http://hostname/index.php?r=ControllerID/ActionID ​

{
    // ...

    "require": {
        // ... other dependencies

        "yiisoft/yii2-imagine": "*"
    }
}

use Yii;
use yii\imagine\Image;

// generate a thumbnail image
Image::thumbnail('@webroot/img/test-image.jpg', 120, 120)
    ->save(Yii::getAlias('@runtime/thumb-test-image.jpg'), ['quality' => 50]);

localhost/your-app/index.php?r=gii // utl to access gii  
 ....  
   'modules' =>  array(  
                'module-name',  
                 'other-module',  
                  'user' =>  array(  
                        'activeAfterRegister' =>  false,  
                ),  
  .....  

< ?php  
namespace yii\helpers;  
  
class ArrayHelper extends BaseArrayHelper  
{  
    public static function merge($x, $y)  
    {  
        // your custom implementation  
    }  
}​

'components' => [  
        'user' => [  
            'identityClass' => 'common\models\User',  
            'enableAutoLogin' => true,  
        'loginUrl' => [ 'yourcontroller/youraction' ],  
        ],  

'defaultRoute' => 'yourcontroller',

$session = Yii::$app->session;              // get a session variable.

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

// check if a session is already open
if ($session->isActive) ...

// open a session
$session->open();

// close a session
$session->close();

// destroys all data registered to a session.
$session->destroy();

Cookies : Yii represents each cookie as an object of yii\web\Cookie. Both yii\web\Request and yii\web\Response maintain a collection of cookies via the property named cookies. The cookie collection in the former represents the cookies submitted in a request, while the cookie collection in the latter represents the cookies that are to be sent to the user.

The part of the application dealing with request and response directly is controller. Therefore, cookies should be read and sent in controller.

Reading Cookies : You can get the cookies in the current request using the following code:

// get the cookie collection (yii\web\CookieCollection) from the "request" component

$cookies = Yii::$app->request->cookies;



// get the "language" cookie value. If the cookie does not exist, return "en" as the default value.

$language = $cookies->getValue('language', 'en');



// an alternative way of getting the "language" cookie value

if (($cookie = $cookies->get('language')) !== null) {

    $language = $cookie->value;

}



// you may also use $cookies like an array

if (isset($cookies['language'])) {

    $language = $cookies['language']->value;

}



// check if there is a "language" cookie

if ($cookies->has('language')) ...

if (isset($cookies['language'])) ...

Sending Cookies : You can send cookies to end users using the following code : 

// get the cookie collection (yii\web\CookieCollection) from the "response" component

$cookies = Yii::$app->response->cookies;



// add a new cookie to the response to be sent

$cookies->add(new \yii\web\Cookie([

    'name' => 'language',

    'value' => 'zh-CN',

]));



// remove a cookie

$cookies->remove('language');

// equivalent to the following

unset($cookies['language']);

return [
    'components' => [
        'errorHandler' => [
            'maxSourceLines' => 20,
        ],
    ],
];

use Yii;
use yii\base\ErrorException;

try {
    10/0;
} catch (ErrorException $e) {
    Yii::warning("Division by zero.");
}
// execution continues...

use yii\web\NotFoundHttpException;

throw new NotFoundHttpException();

Yii::debug('start calculating average revenue');

Yii::debug('start calculating average revenue', __METHOD__);

return [
    // the "log" component must be loaded during bootstrapping time
    'bootstrap' => ['log'],
    // the "log" component process messages with timestamp. Set PHP timezone to create correct timestamp
    'timeZone' => 'America/Los_Angeles',
    'components' => [
        'log' => [
            'targets' => [
                [
                    'class' => 'yii\log\DbTarget',
                    'levels' => ['error', 'warning'],
                ],
                [
                    'class' => 'yii\log\EmailTarget',
                    'levels' => ['error'],
                    'categories' => ['yii\db\*'],
                    'message' => [
                       'from' => ['log@example.com'],
                       'to' => ['admin@example.com', 'developer@example.com'],
                       'subject' => 'Database errors at example.com',
                    ],
                ],
            ],
        ],
    ],
];

// $className is a fully qualified class name without the leading backslash
$classFile = Yii::getAlias('@' . str_replace('\\', '/', $className) . '.php');

Yii::$classMap['foo\bar\MyClass'] = 'path/to/MyClass.php';

require __DIR__ . '/../vendor/autoload.php';
require __DIR__ . '/../vendor/yiisoft/yii2/Yii.php';

class Foo
{
    public function __construct(Bar $bar)
    {
    }
}

$foo = $container->get('Foo');
// which is equivalent to the following:
$bar = new Bar;
$foo = new Foo($bar);

class MyClass extends \yii\base\Component
{
    public function __construct(/*Some lightweight dependencies here*/, $config = [])
    {
        // ...
    }

    public function doSomething($param1, \my\heavy\Dependency $something)
    {
        // do something with $something
    }
}

$obj = new MyClass(/*...*/);
Yii::$container->invoke([$obj, 'doSomething'], ['param1' => 42]); // $something will be provided by the DI container

use yii\base\BaseObject;

class Foo extends BaseObject
{
    public $bar;

    private $_qux;

    public function getQux()
    {
        return $this->_qux;
    }

    public function setQux(Qux $qux)
    {
        $this->_qux = $qux;
    }
}

$container->get('Foo', [], [
    'bar' => $container->get('Bar'),
    'qux' => $container->get('Qux'),
]);

$container->set('Foo', function ($container, $params, $config) {
    $foo = new Foo(new Bar);
    // ... other initializations ...
    return $foo;
});

$foo = $container->get('Foo');

class FooBuilder
{
    public static function build($container, $params, $config)
    {
        $foo = new Foo(new Bar);
        // ... other initializations ...
        return $foo;
    }
}

$container->set('Foo', ['app\helper\FooBuilder', 'build']);

$foo = $container->get('Foo');

$container = new \yii\di\Container;

// register a class name as is. This can be skipped.
$container->set('yii\db\Connection');

// register an interface
// When a class depends on the interface, the corresponding class
// will be instantiated as the dependent object
$container->set('yii\mail\MailInterface', 'yii\swiftmailer\Mailer');

// register an alias name. You can use $container->get('foo')
// to create an instance of Connection
$container->set('foo', 'yii\db\Connection');

// register an alias with `Instance::of`
$container->set('bar', Instance::of('foo'));

// register a class with configuration. The configuration
// will be applied when the class is instantiated by get()
$container->set('yii\db\Connection', [
    'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
    'username' => 'root',
    'password' => '',
    'charset' => 'utf8',
]);

// register an alias name with class configuration
// In this case, a "class" or "__class" element is required to specify the class
$container->set('db', [
    'class' => 'yii\db\Connection',
    'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
    'username' => 'root',
    'password' => '',
    'charset' => 'utf8',
]);

// register callable closure or array
// The callable will be executed each time when $container->get('db') is called
$container->set('db', function ($container, $params, $config) {
    return new \yii\db\Connection($config);
});
$container->set('db', ['app\db\DbFactory', 'create']);

// register a component instance
// $container->get('pageCache') will return the same instance each time it is called
$container->set('pageCache', new FileCache);

$container->setSingleton('yii\db\Connection', [
    'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
    'username' => 'root',
    'password' => '',
    'charset' => 'utf8',
]);

// "db" is a previously registered alias name
$db = $container->get('db');

// equivalent to: $engine = new \app\components\SearchEngine($apiKey, $apiSecret, ['type' => 1]);
$engine = $container->get('app\components\SearchEngine', [$apiKey, $apiSecret], ['type' => 1]);

// equivalent to: $api = new \app\components\Api($host, $apiKey);
$api = $container->get('app\components\Api', ['host' => $host, 'apiKey' => $apiKey]);

namespace app\models;

use yii\base\BaseObject;
use yii\db\Connection;
use yii\di\Container;

interface UserFinderInterface
{
    function findUser();
}

class UserFinder extends BaseObject implements UserFinderInterface
{
    public $db;

    public function __construct(Connection $db, $config = [])
    {
        $this->db = $db;
        parent::__construct($config);
    }

    public function findUser()
    {
    }
}

class UserLister extends BaseObject
{
    public $finder;

    public function __construct(UserFinderInterface $finder, $config = [])
    {
        $this->finder = $finder;
        parent::__construct($config);
    }
}

$container = new Container;
$container->set('yii\db\Connection', [
    'dsn' => '...',
]);
$container->set('app\models\UserFinderInterface', [
    'class' => 'app\models\UserFinder',
]);
$container->set('userLister', 'app\models\UserLister');

$lister = $container->get('userLister');

// which is equivalent to:

$db = new \yii\db\Connection(['dsn' => '...']);
$finder = new UserFinder($db);
$lister = new UserLister($finder);

use yii\di\ServiceLocator;
use yii\caching\FileCache;

$locator = new ServiceLocator;

// register "cache" using a class name that can be used to create a component
$locator->set('cache', 'yii\caching\ApcCache');

// register "db" using a configuration array that can be used to create a component
$locator->set('db', [
    'class' => 'yii\db\Connection',
    'dsn' => 'mysql:host=localhost;dbname=demo',
    'username' => 'root',
    'password' => '',
]);

// register "search" using an anonymous function that builds a component
$locator->set('search', function () {
    return new app\components\SolrService;
});

// register "pageCache" using a component
$locator->set('pageCache', new FileCache);

$cache = $locator->get('cache');
// or alternatively
$cache = $locator->cache;

$db = new yii\db\Connection([
    'dsn' => 'mysql:host=localhost;dbname=example',
    'username' => 'root',
    'password' => '',
    'charset' => 'utf8',
]);

return [
    // ...
    'components' => [
        // ...
        'db' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=example',
            'username' => 'root',
            'password' => '',
            'charset' => 'utf8',
        ],
    ],
    // ...
];

'db' => [
    'class' => 'yii\db\Connection',
    'driverName' => 'mysql',
    'dsn' => 'odbc:Driver={MySQL};Server=localhost;Database=test',
    'username' => 'root',
    'password' => '',
],

// return a set of rows. each row is an associative array of column names and values.
// an empty array is returned if the query returned no results
$posts = Yii::$app->db->createCommand('SELECT * FROM post')
            ->queryAll();

// return a single row (the first row)
// false is returned if the query has no result
$post = Yii::$app->db->createCommand('SELECT * FROM post WHERE id=1')
           ->queryOne();

// return a single column (the first column)
// an empty array is returned if the query returned no results
$titles = Yii::$app->db->createCommand('SELECT title FROM post')
             ->queryColumn();

// return a scalar value
// false is returned if the query has no result
$count = Yii::$app->db->createCommand('SELECT COUNT(*) FROM post')
             ->queryScalar();

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

// output: January 1, 2014
echo $formatter->asDate('2014-01-01', 'long');
 
// output: 12.50%
echo $formatter->asPercent(0.125, 2);
 
// output: <a href="mailto:cebe@example.com">cebe@example.com</a>
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); 

// create the data provider by configuring its pagination and sort properties
$provider = new XyzDataProvider([
    'pagination' => [...],
    'sort' => [...],
]);

// retrieves paginated and sorted data
$models = $provider->getModels();

// get the number of data items in the current page
$count = $provider->getCount();

// get the total number of data items across all pages
$totalCount = $provider->getTotalCount();

echo yii\grid\GridView::widget([
    'dataProvider' => $dataProvider,
]);

$key = Yii::$app->getSecurity()->generateRandomString();

// $data and $secretKey are obtained from the form
$encryptedData = Yii::$app->getSecurity()->encryptByPassword($data, $secretKey);
// store $encryptedData to database

Subsequently when user wants to read the data:

// $secretKey is obtained from user input, $encryptedData is from the database
$data = Yii::$app->getSecurity()->decryptByPassword($encryptedData, $secretKey);

It's also possible to use key instead of password via yii\base\Security::encryptByKey() and yii\base\Security::decryptByKey().

// $secretKey our application or user secret, $genuineData obtained from a reliable source

$data = Yii::$app->getSecurity()->hashData($genuineData, $secretKey);

Checks if the data integrity has been compromised

// $secretKey our application or user secret, $data obtained from an unreliable source

$data = Yii::$app->getSecurity()->validateData($data, $secretKey);

// try retrieving $data from cache
$data = $cache->get($key);

if ($data === false) {
    // $data is not found in cache, calculate it from scratch
    $data = $this->calculateSomething();

    // store $data in cache so that it can be retrieved next time
    $cache->set($key, $data);
}
// $data is available here

$data = $cache->getOrSet($key, function () {
    return $this->calculateSomething();
});

$user_id = 42;
$data = $cache->getOrSet($key, function () use ($user_id) {
    return $this->calculateSomething($user_id);
});

if ($this->beginCache($id)) {

    // ... generate content here ...

    $this->endCache();
}

/**
 * @param Action $action the action object that is being handled currently
 * @param array $params the value of the "params" property
 * @return int a UNIX timestamp representing the page modification time
 */
function ($action, $params)

public function behaviors()
{
    return [
        [
            'class' => 'yii\filters\HttpCache',
            'only' => ['index'],
            'lastModified' => function ($action, $params) {
                $q = new \yii\db\Query();
                return $q->from('post')->max('updated_at');
            },
        ],
    ];
}

/**
 * @param Action $action the action object that is being handled currently
 * @param array $params the value of the "params" property
 * @return string a string used as the seed for generating an ETag hash
 */
function ($action, $params)

public function behaviors()
{
    return [
        [
            'class' => 'yii\filters\HttpCache',
            'only' => ['view'],
            'etagSeed' => function ($action, $params) {
                $post = $this->findModel(\Yii::$app->request->get('id'));
                return serialize([$post->title, $post->content]);
            },
        ],
    ];
}

Cache-Control: public, max-age=3600

use yii\helpers\Html;

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

<?php

namespace yii\helpers;

class ArrayHelper extends BaseArrayHelper
{
    public static function merge($a, $b)
    {
        // your custom implementation
    }
}

Yii::$classMap['yii\helpers\ArrayHelper'] = '@app/components/ArrayHelper.php';

<?php
namespace app\tests\fixtures;

use yii\test\ActiveFixture;

class UserFixture extends ActiveFixture
{
    public $modelClass = 'app\models\User';
}