Symfony 4.x

https://symfony.com/doc/4.x
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### Output of start()

Source: https://symfony.com/doc/4.x/components/console/helpers/debug_formatter.html

Example output from the start() method.

```text
RUN Some process description
```

--------------------------------

### Render form start tag with form_start() and change method to GET

Source: https://symfony.com/doc/4.x/form/form_customization.html

Renders the start tag of a form using form_start(). The example passes a 'method' variable to change the submission method to GET.

```twig
{# render the start tag and change the submission method #}
{{ form_start(form, {'method': 'GET'}) }}
```

--------------------------------

### Start Server with Custom IP and Port

Source: https://symfony.com/doc/4.x/setup/built_in_web_server.html

Shows how to specify a custom IP address and port for the server. Passing '*' as the IP binds to 0.0.0.0, meaning any local IP address.

```bash
# passing a specific IP and port
$ php bin/console server:start 192.168.0.1:8080

# passing '*' as the IP means to use 0.0.0.0 (i.e. any local IP address)
$ php bin/console server:start *:8080
```

--------------------------------

### Installation Step 1

Source: https://symfony.com/doc/4.x/components/event_dispatcher.html

Placeholder step indicator in the Installation section; the actual command is shown in the following block.

```text
1
```

--------------------------------

### Get country code with Timezones::getCountryCode()

Source: https://symfony.com/doc/4.x/components/intl.html

Get the country code for a given timezone ID using Timezones::getCountryCode(). The example returns 'CA' for 'America/Vancouver'.

```php
$countryCode = Timezones::getCountryCode('America/Vancouver');
// => $countryCode = 'CA' (CA = Canada)
```

--------------------------------

### Example configuration files to import

Source: https://symfony.com/doc/4.x/service_container/import.html

Example configuration files that can be imported using the `imports` key. These files contain placeholder parameters and services definitions.

```yaml
# config/services/mailer.yaml
parameters:
    # ... some parameters

services:
    # ... some services
```

```xml
<!-- config/services/mailer.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd">

    <parameters>
        <!-- ... some parameters -->
    </parameters>

    <services>
        <!-- ... some services -->
    </services>
</container>
```

```php
// config/services/mailer.php

// ... some parameters
// ... some services
```

--------------------------------

### Retrieve service by index from ServiceLocator

Source: https://symfony.com/doc/4.x/service_container/service_subscribers_locators.html

Shows how to retrieve a service from the locator by its index. The example gets the service indexed as 'handler_two' using the locator's get() method.

```php
// src/Handler/HandlerCollection.php
namespace App\Handler;

use Symfony\Component\DependencyInjection\ServiceLocator;

class HandlerCollection
{
    public function __construct(ServiceLocator $locator)
    {
        $handlerTwo = $locator->get('handler_two');
    }

    // ...
}

```

--------------------------------

### Start the dump server with var-dump-server

Source: https://symfony.com/doc/4.x/components/var_dumper.html

Start the dump server out-of-the-box using the var-dump-server command.

```bash
$ ./vendor/bin/var-dump-server
  [OK] Server listening on tcp://127.0.0.1:9912
```

--------------------------------

### Get process PID with getPid()

Source: https://symfony.com/doc/4.x/components/process.html

Starts a process and retrieves its PID using getPid().

```php
use Symfony\Component\Process\Process;

$process = new Process(['/usr/bin/php', 'worker.php']);
$process->start();

$pid = $process->getPid();
```

--------------------------------

### Create the framework directory

Source: https://symfony.com/doc/4.x/create_framework/introduction.html

Creates and enters the directory where the framework code will be stored.

```bash
$ mkdir framework
$ cd framework
```

--------------------------------

### Render a complete form with form() and change method to GET

Source: https://symfony.com/doc/4.x/form/form_customization.html

Renders the HTML of a complete form using the form() function. The example passes a 'method' variable to change the submission method to GET.

```twig
{# render the form and change the submission method #}
{{ form(form, {'method': 'GET'}) }}
```

--------------------------------

### Set SYMFONY_REQUIRE to install a specific Symfony version

Source: https://symfony.com/doc/4.x/bundles/best_practices.html

Use the SYMFONY_REQUIRE environment variable with Symfony Flex to install a specific Symfony version. The example shows setting it to 5.*, but you can adjust the version. It also includes commands to install Symfony Flex and update dependencies.

```bash
# this requires Symfony 5.x for all Symfony packages
export SYMFONY_REQUIRE=5.*
# alternatively you can run this command to update composer.json config
# composer config extra.symfony.require "5.*"

# install Symfony Flex in the CI environment
composer global require --no-progress --no-scripts --no-plugins symfony/flex

# install the dependencies (using --prefer-dist and --no-progress is
# recommended to have a better output and faster download time)
composer update --prefer-dist --no-progress
```

--------------------------------

### Example URL with customized go_to and back_to parameters

Source: https://symfony.com/doc/4.x/security/form_login.html

Example URL showing the customized query string parameters after applying the configuration. The go_to and back_to parameters replace the default target_path and failure_path parameters.

```text
http://example.com/some/path?go_to=/dashboard&back_to=/forgot-password
```

--------------------------------

### Call ServiceLocator as a callable

Source: https://symfony.com/doc/4.x/service_container/service_subscribers_locators.html

Shows that the injected ServiceLocator is callable, so you can invoke it directly with the command class to get the handler instead of using has() and get(). This is an alternative to the previous example's handle() method body.

```php
// ...
$handler = ($this->locator)($commandClass);

return $handler->handle($command);
```

--------------------------------

### progressStart()

Source: https://symfony.com/doc/4.x/console/style.html

Displays a progress bar with a number of steps equal to the argument passed. If no argument is passed, the length is unknown.

```APIDOC
## progressStart()

### Description
Displays a progress bar with a number of steps equal to the argument passed to the method. If no argument is passed, the length of the progress bar is unknown.

### Method
progressStart

### Parameters
- **steps** (int) - Optional - The number of steps for the progress bar. If omitted, the length is unknown.

### Request Example
```php
// displays a progress bar of unknown length
$io->progressStart();

// displays a 100-step length progress bar
$io->progressStart(100);
```

### Response
No return value.
```

--------------------------------

### Version output with name

Source: https://symfony.com/doc/4.x/components/console/usage.html

Example output when the application name and version are set.

```text
Acme Console Application version 1.2
```

--------------------------------

### Displaying Flash Messages by Type with get()

Source: https://symfony.com/doc/4.x/components/http_foundation/sessions.html

Retrieves and displays flash messages of a specific type using the get() method, which clears the messages after retrieval. The example shows displaying warnings and errors separately.

```php
// display warnings
foreach ($session->getFlashBag()->get('warning', []) as $message) {
    echo '<div class="flash-warning">'.$message.'</div>';
}

// display errors
foreach ($session->getFlashBag()->get('error', []) as $message) {
    echo '<div class="flash-error">'.$message.'</div>';
}
```

--------------------------------

### progressStart() - Display a progress bar

Source: https://symfony.com/doc/4.x/console/style.html

Displays a progress bar with a number of steps equal to the argument passed. If no argument is passed, the length is unknown.

```php
// displays a progress bar of unknown length
$io->progressStart();

// displays a 100-step length progress bar
$io->progressStart(100);
```

--------------------------------

### Get localized GMT offset with getGmtOffset()

Source: https://symfony.com/doc/4.x/components/intl.html

Pass a locale as the third optional argument to getGmtOffset() to get a localized string representation of the GMT offset. The example shows Arabic ('ar') and Dzongkha ('dz') translations.

```php
$offset = Timezones::getGmtOffset('Europe/Madrid', strtotime('October 28, 2019'), 'ar'); // $offset = 'غرينتش+01:00'
$offset = Timezones::getGmtOffset('Europe/Madrid', strtotime('October 28, 2019'), 'dz'); // $offset = 'ཇི་ཨེམ་ཏི་+01:00'
```

--------------------------------

### HTTP GET request with headers

Source: https://symfony.com/doc/4.x/introduction/http_fundamentals.html

Example HTTP request sent by a browser to the xkcd web server. The first line contains the HTTP method (GET) and the URI (/), followed by request headers such as Host, Accept, and User-Agent.

```http
GET / HTTP/1.1
Host: xkcd.com
Accept: text/html
User-Agent: Mozilla/5.0 (Macintosh)
```

--------------------------------

### Basic Filesystem usage with mkdir()

Source: https://symfony.com/doc/4.x/components/filesystem.html

Shows the basic usage of the Filesystem class: instantiate it and call mkdir() inside a try-catch block to handle IOExceptionInterface. The example creates a directory in the system temp directory with a random name.

```php
use Symfony\Component\Filesystem\Exception\IOExceptionInterface;
use Symfony\Component\Filesystem\Filesystem;

$filesystem = new Filesystem();

try {
    $filesystem->mkdir(sys_get_temp_dir().'/'.random_int(0, 1000));
} catch (IOExceptionInterface $exception) {
    echo "An error occurred while creating your directory at ".$exception->getPath();
}
```

--------------------------------

### Show version with --version or -V

Source: https://symfony.com/doc/4.x/components/console/usage.html

Outputs the application name and version using --version or -V.

```bash
$ php application.php list --version
$ php application.php list -V
```

--------------------------------

### Get Script Names in a Specific Locale

Source: https://symfony.com/doc/4.x/components/intl.html

Demonstrates passing a locale as the last optional parameter to Scripts methods. The locale defaults to the current default locale if not provided. Examples show using 'de' to get German translations.

```php
$scripts = Scripts::getNames('de');
// => ['Adlm' => 'Adlam', 'Afak' => 'Afaka', ...]

$script = Scripts::getName('Hans', 'de');
// => 'Vereinfacht'
```

--------------------------------

### Start the dump server with server:dump

Source: https://symfony.com/doc/4.x/components/var_dumper.html

Start the dump server with the server:dump command. The first command displays dumped data in the console, while the second stores it in an HTML file using the --format=html option.

```bash
# displays the dumped data in the console:
$ php bin/console server:dump
  [OK] Server listening on tcp://0.0.0.0:9912

# stores the dumped data in a file using the HTML format:
$ php bin/console server:dump --format=html > dump.html
```

--------------------------------

### Get Language Names in a Specific Locale

Source: https://symfony.com/doc/4.x/components/intl.html

Demonstrates passing a locale as the last optional parameter to Languages methods. The locale defaults to the current default locale if not provided. Examples show using 'de' to get German translations.

```php
$languages = Languages::getNames('de');
// => ['ab' => 'Abchasisch', 'ace' => 'Aceh', ...]

$languages = Languages::getAlpha3Names('de');
// => ['abk' => 'Abchasisch', 'ace' => 'Aceh', ...]

$language = Languages::getName('fr', 'de');
// => 'Französisch'

$language = Languages::getAlpha3Name('fra', 'de');
// => 'Französisch'
```

--------------------------------

### Install Sass dependencies and run dev server

Source: https://symfony.com/doc/4.x/frontend/encore/simple-example.html

Install sass-loader and sass using either Yarn or npm, then run the dev server.

```bash
# if you use the Yarn package manager
$ yarn add sass-loader@^12.0.0 sass --dev
$ yarn encore dev --watch

# if you use the npm package manager
$ npm install sass-loader@^12.0.0 sass --save-dev
$ npm run watch
```

--------------------------------

### Get timezone offsets at a specific timestamp

Source: https://symfony.com/doc/4.x/components/intl.html

Pass a timestamp as the second argument to getRawOffset() and getGmtOffset() to get the offset at a specific point in time, accounting for daylight saving time (DST). The example shows DST transitions in Madrid in 2019.

```php
// In 2019, the DST period in Madrid (Spain) went from March 31 to October 27
$offset = Timezones::getRawOffset('Europe/Madrid', strtotime('March 31, 2019'));   // $offset = 3600
$offset = Timezones::getRawOffset('Europe/Madrid', strtotime('April 1, 2019'));    // $offset = 7200
$offset = Timezones::getGmtOffset('Europe/Madrid', strtotime('October 27, 2019')); // $offset = 'GMT+02:00'
$offset = Timezones::getGmtOffset('Europe/Madrid', strtotime('October 28, 2019')); // $offset = 'GMT+01:00'
```

--------------------------------

### Create phpunit.xml.dist Configuration

Source: https://symfony.com/doc/4.x/create_framework/unit_testing.html

PHPUnit configuration file for the example.com project. It sets the autoloader as bootstrap, enables code coverage for the src directory, and defines a test suite that looks for tests in the tests directory.

```xml
<?xml version="1.0" encoding="UTF-8"?>
<phpunit
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
    backupGlobals="false"
    colors="true"
    bootstrap="vendor/autoload.php"
>
    <coverage processUncoveredFiles="true">
        <include>
            <directory suffix=".php">./src</directory>
        </include>
    </coverage>

    <testsuites>
        <testsuite name="Test Suite">
            <directory>./tests</directory>
        </testsuite>
    </testsuites>
</phpunit>
```

--------------------------------

### Configure automatic workers in .symfony.local.yaml

Source: https://symfony.com/doc/4.x/setup/symfony_server.html

Add a `workers` section to `.symfony.local.yaml` to start processes automatically with `symfony server:start`. The example shows built-in workers `yarn_encore_watch` and `messenger_consume_async` (with commented-out custom configurations) and a custom `build_spa` command. This feature is experimental and may change or be removed.

```yaml
# .symfony.local.yaml
workers:
    # built-in command that builds and watches front-end assets
    # yarn_encore_watch:
    #     cmd: ['yarn', 'encore', 'dev', '--watch']
    yarn_encore_watch: ~

    # built-in command that starts messenger consumer
    # messenger_consume_async:
    #     cmd: ['symfony', 'console', 'messenger:consume', 'async']
    #     watch: ['config', 'src', 'templates', 'vendor']
    messenger_consume_async: ~

    # you can also add your own custom commands
    build_spa:
        cmd: ['yarn', '--cwd', './spa/', 'dev']
```

--------------------------------

### Run PHPUnit tests

Source: https://symfony.com/doc/4.x/create_framework/unit_testing.html

Executes the test suite from the example.com directory. A green bar indicates success; otherwise there is a bug in the test or framework code.

```bash
$ ./vendor/bin/phpunit
```

--------------------------------

### Basic Session Usage with Symfony HttpFoundation

Source: https://symfony.com/doc/4.x/components/http_foundation/sessions.html

Shows how to create a session, start it, set and get attributes, add a flash message, and retrieve flash messages. Note that the session starts on demand if any session request is made, and you must avoid using native PHP session functions.

```php
use Symfony\Component\HttpFoundation\Session\Session;

$session = new Session();
$session->start();

// set and get session attributes
$session->set('name', 'Drak');
$session->get('name');

// set flash messages
$session->getFlashBag()->add('notice', 'Profile updated');

// retrieve messages
foreach ($session->getFlashBag()->get('notice', []) as $message) {
    echo '<div class="flash-notice">'.$message.'</div>';
}
```

--------------------------------

### Start Server for Virtual Machine Access

Source: https://symfony.com/doc/4.x/setup/built_in_web_server.html

Starts the server listening on all IP addresses assigned to the virtual machine, allowing access from a host machine's browser. Never use this on a computer directly accessible from the Internet.

```bash
$ php bin/console server:start 0.0.0.0:8000
```

--------------------------------

### API Platform package configuration (config/packages/api_platform.yaml)

Source: https://symfony.com/doc/4.x/configuration.html

Example of a default configuration file created by Symfony Flex when installing the API Platform package, defining mapping paths for entities.

```yaml
# config/packages/api_platform.yaml
api_platform:
    mapping:
        paths: ['%kernel.project_dir%/src/Entity']
```

--------------------------------

### Create Symfony application with Symfony binary (webapp vs default)

Source: https://symfony.com/doc/4.x/setup.html

Run these commands in your console to create a new Symfony application using the Symfony binary. The first command installs all packages needed for traditional web applications via the --webapp option; the second creates a microservice, console application, or API with fewer packages.

```bash
# run this if you are building a traditional web application
$ symfony new my_project_directory --version=4.4 --webapp

# run this if you are building a microservice, console application or API
$ symfony new my_project_directory --version=4.4
```

--------------------------------

### Mailer class with options array

Source: https://symfony.com/doc/4.x/components/options_resolver.html

Initial Mailer class with four options (host, username, password, port) stored in an array. Used as the starting point for the OptionsResolver examples.

```php
class Mailer
{
    protected $options;

    public function __construct(array $options = [])
    {
        $this->options = $options;
    }
}
```

--------------------------------

### Enable magic __call() with enableMagicCall() for getValue()

Source: https://symfony.com/doc/4.x/components/property_access.html

Shows how to enable the magic __call() method for getValue() using enableMagicCall(). This feature is disabled by default. The example handles both get and set calls.

```php
// ...
class Person
{
    private $children = [
        'wouter' => [...],
    ];

    public function __call($name, $args)
    {
        $property = lcfirst(substr($name, 3));
        if ('get' === substr($name, 0, 3)) {
            return $this->children[$property] ?? null;
        } elseif ('set' === substr($name, 0, 3)) {
            $value = 1 == count($args) ? $args[0] : null;
            $this->children[$property] = $value;
        }
    }
}

$person = new Person();

// enables PHP __call() magic method
$propertyAccessor = PropertyAccess::createPropertyAccessorBuilder()
    ->enableMagicCall()
    ->getPropertyAccessor();

var_dump($propertyAccessor->getValue($person, 'wouter')); // [...]
```

--------------------------------

### Common DSN examples for RedisAdapter::createConnection()

Source: https://symfony.com/doc/4.x/components/cache/adapters/redis_adapter.html

Provides multiple examples of valid DSNs showing combinations of host, port, database index, authentication, timeout, socket, and alternate syntax. Includes a single DSN defining multiple servers with the 'redis_cluster=1' parameter.

```php
use Symfony\Component\Cache\Adapter\RedisAdapter;

// host "my.server.com" and port "6379"
RedisAdapter::createConnection('redis://my.server.com:6379');

// host "my.server.com" and port "6379" and database index "20"
RedisAdapter::createConnection('redis://my.server.com:6379/20');

// host "localhost", auth "abcdef" and timeout 5 seconds
RedisAdapter::createConnection('redis://abcdef@localhost?timeout=5');

// socket "/var/run/redis.sock" and auth "bad-pass"
RedisAdapter::createConnection('redis://bad-pass@/var/run/redis.sock');

// host "redis1" (docker container) with alternate DSN syntax and selecting database index "3"
RedisAdapter::createConnection('redis:?host[redis1:6379]&dbindex=3');

// providing credentials with alternate DSN syntax
RedisAdapter::createConnection('redis:default:verysecurepassword@?host[redis1:6379]&dbindex=3');

// a single DSN can also define multiple servers
RedisAdapter::createConnection(
    'redis:?host[localhost]&host[localhost:6379]&host[/var/run/redis.sock:]&auth=my-password&redis_cluster=1'
);
```

--------------------------------

### Query with Query Builder createQueryBuilder()

Source: https://symfony.com/doc/4.x/doctrine.html

Uses the Query Builder for object-oriented queries, recommended for dynamically built queries. The example shows conditional andWhere() and a commented alternative to get a single result.

```php
// src/Repository/ProductRepository.php

// ...
class ProductRepository extends ServiceEntityRepository
{
    public function findAllGreaterThanPrice(int $price, bool $includeUnavailableProducts = false): array
    {
        // automatically knows to select Products
        // the "p" is an alias you'll use in the rest of the query
        $qb = $this->createQueryBuilder('p')
            ->where('p.price > :price')
            ->setParameter('price', $price)
            ->orderBy('p.price', 'ASC');

        if (!$includeUnavailableProducts) {
            $qb->andWhere('p.available = TRUE');
        }

        $query = $qb->getQuery();

        return $query->execute();

        // to get just one result:
        // $product = $query->setMaxResults(1)->getOneOrNullResult();
    }
}
```

--------------------------------

### Create databases for multiple connections

Source: https://symfony.com/doc/4.x/doctrine/multiple_entity_managers.html

Commands to create databases for each connection. Use --connection=customer to target the customer connection; omitting it uses the default connection.

```bash
# Play only with "default" connection
$ php bin/console doctrine:database:create

# Play only with "customer" connection
$ php bin/console doctrine:database:create --connection=customer
```

--------------------------------

### Static import of VideoPlayer module

Source: https://symfony.com/doc/4.x/frontend/encore/code-splitting.html

Static import of a large module that is always bundled into the final JavaScript file, even if it is rarely used. This is the starting point for the async code splitting example.

```javascript
// assets/js/app.js

import $ from 'jquery';
// a fictional "large" module (e.g. it imports video.js internally)
import VideoPlayer from './components/VideoPlayer';

$('.js-open-video').on('click', function() {
    // use the larger VideoPlayer module
    const player = new VideoPlayer('some-element');
});
```

--------------------------------

### Install Serializer Pack

Source: https://symfony.com/doc/4.x/controller/error_pages.html

Run this command to install the Serializer component, which is required for overriding non-HTML error output.

```bash
$ composer require symfony/serializer-pack
```

--------------------------------

### Check process timeout regularly with checkTimeout()

Source: https://symfony.com/doc/4.x/components/process.html

For long running commands, you must check the timeout regularly using checkTimeout() inside a loop. This example starts the process and checks the timeout periodically.

```php
$process->setTimeout(3600);
$process->start();

while ($condition) {
    // ...

    // check if the timeout is reached
    $process->checkTimeout();

    usleep(200000);
}
```

--------------------------------

### Serve assets with file:// and ftp:// protocols

Source: https://symfony.com/doc/4.x/components/asset.html

Use UrlPackage with file:// and ftp:// protocols to serve local or remote files. EmptyVersionStrategy is used to avoid versioning. The getUrl method returns the full URL with the base path.

```php
use Symfony\Component\Asset\UrlPackage;
// ...

$localPackage = new UrlPackage(
    'file:///path/to/images/',
    new EmptyVersionStrategy()
);

$ftpPackage = new UrlPackage(
    'ftp://example.com/images/',
    new EmptyVersionStrategy()
);

echo $localPackage->getUrl('/logo.png');
// result: file:///path/to/images/logo.png

echo $ftpPackage->getUrl('/logo.png');
// result: ftp://example.com/images/logo.png
```

--------------------------------

### Create Database with doctrine:database:create

Source: https://symfony.com/doc/4.x/doctrine.html

Create the database specified in DATABASE_URL. Run after configuring connection parameters. Additional Doctrine commands are available via php bin/console list doctrine.

```bash
$ php bin/console doctrine:database:create
```

--------------------------------

### Customize Confirmation Regex

Source: https://symfony.com/doc/4.x/components/console/helpers/questionhelper.html

Customize the regex used to check if an answer means 'yes' via the third constructor argument. This example allows anything starting with 'y' or 'j'. The default regex is '/^y/i'.

```php
$question = new ConfirmationQuestion(
    'Continue with this action?',
    false,
    '/^(y|j)/i'
);
```

--------------------------------

### Implement AuthenticationEntryPointInterface in PHP

Source: https://symfony.com/doc/4.x/security/access_denied_handler.html

Create a class that implements AuthenticationEntryPointInterface. The start() method is called when an unauthenticated user tries to access a protected resource. This example adds a flash message and redirects to the login page.

```php
// src/Security/AuthenticationEntryPoint.php
namespace App\Security;

use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use Symfony\Component\Security\Core\Exception\AuthenticationException;
use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;

class AuthenticationEntryPoint implements AuthenticationEntryPointInterface
{
    private $urlGenerator;
    private $session;

    public function __construct(UrlGeneratorInterface $urlGenerator, SessionInterface $session)
    {
        $this->urlGenerator = $urlGenerator;
        $this->session = $session;
    }

    public function start(Request $request, AuthenticationException $authException = null): RedirectResponse
    {
        // add a custom flash message and redirect to the login page
        $this->session->getFlashBag()->add('note', 'You have to login in order to access this page.');

        return new RedirectResponse($this->urlGenerator->generate('security_login'));
    }
}
```

--------------------------------

### Basic WebTestCase with createClient and assertions

Source: https://symfony.com/doc/4.x/testing.html

Example of a basic application test that extends WebTestCase. It creates a client, requests the homepage, and asserts a successful response and that an h1 tag contains 'Hello World'.

```php
// tests/Controller/PostControllerTest.php
namespace App\Tests\Controller;

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;

class PostControllerTest extends WebTestCase
{
    public function testSomething(): void
    {
        // This calls KernelTestCase::bootKernel(), and creates a
        // "client" that is acting as the browser
        $client = static::createClient();

        // Request a specific page
        $crawler = $client->request('GET', '/');

        // Validate a successful response and some content
        $this->assertResponseIsSuccessful();
        $this->assertSelectorTextContains('h1', 'Hello World');
    }
}

```

--------------------------------

### Create a new Symfony Demo project with symfony new --demo

Source: https://symfony.com/doc/4.x/setup.html

The first block is a placeholder or step indicator, and the second is the command to create a new Symfony project based on the demo application. Run the command in your terminal to set up the project.

```text
1
```

```bash
$ symfony new my_project_directory --demo
```

--------------------------------

### AttributeBagInterface

Source: https://symfony.com/doc/4.x/components/http_foundation/sessions.html

The AttributeBagInterface defines the standard methods for handling session attributes, including set, get, all, has, replace, remove, and clear. This snippet includes the interface methods and an example of using the default AttributeBag implementation.

```APIDOC
## AttributeBagInterface

### Description
Defines the API for session attribute storage, including methods to set, get, and manage attributes.

### Methods

#### set()
- **set(name, value)** - Sets an attribute by name.

#### get()
- **get(name)** - Gets an attribute by name.
- **get(name, default_value)** - Gets an attribute with a default value if it doesn't exist.

#### all()
- **all()** - Gets all attributes as an associative array of `name => value`.

#### has()
- **has(name)** - Returns `true` if the attribute exists.

#### replace()
- **replace(attributes)** - Sets multiple attributes at once using an associative array. Replaces existing attributes or creates new ones.

#### remove()
- **remove(name)** - Deletes an attribute by name and returns its value.

#### clear()
- **clear()** - Deletes all attributes.

### Example
```php
use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage;

$session = new Session(new NativeSessionStorage(), new AttributeBag());
$session->set('token', 'a6c1e0b6');
// ...
$token = $session->get('token');
// if the attribute may or may not exist, you can define a default value for it
$token = $session->get('attribute-name', 'default-attribute-value');
// ...
$session->clear();
```
```

--------------------------------

### Move framework setup into Simplex\Framework class

Source: https://symfony.com/doc/4.x/create_framework/dependency_injection.html

Moves the framework setup from the front controller into the Simplex\Framework class by extending HttpKernel\HttpKernel. The constructor builds the routing context, matcher, request stack, controller and argument resolvers, and registers the error, router, response, and string response listeners before calling the parent constructor.

```php
// example.com/src/Simplex/Framework.php
namespace Simplex;

use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\HttpFoundation;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\HttpKernel;
use Symfony\Component\Routing;

class Framework extends HttpKernel\HttpKernel
{
    public function __construct($routes)
    {
        $context = new Routing\RequestContext();
        $matcher = new Routing\Matcher\UrlMatcher($routes, $context);
        $requestStack = new RequestStack();

        $controllerResolver = new HttpKernel\Controller\ControllerResolver();
        $argumentResolver = new HttpKernel\Controller\ArgumentResolver();

        $dispatcher = new EventDispatcher();
        $dispatcher->addSubscriber(new HttpKernel\EventListener\ErrorListener(
            'Calendar\Controller\ErrorController::exception'
        ));
        $dispatcher->addSubscriber(new HttpKernel\EventListener\RouterListener($matcher, $requestStack));
        $dispatcher->addSubscriber(new HttpKernel\EventListener\ResponseListener('UTF-8'));
        $dispatcher->addSubscriber(new StringResponseListener());

        parent::__construct($dispatcher, $controllerResolver, $requestStack, $argumentResolver);
    }
}
```

--------------------------------

### Example manifest.json content

Source: https://symfony.com/doc/4.x/frontend/encore/versioning.html

Shows the structure of the manifest.json file generated by Encore, mapping original asset paths to versioned filenames. This file is needed to get the versioned filename of other files like fonts and images.

```json
{
    "build/app.js": "/build/app.123abc.js",
    "build/dashboard.css": "/build/dashboard.a4bf2d.css",
    "build/images/logo.png": "/build/images/logo.3eed42.png"
}
```
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