Symfony Interview Questions and Answers

1. Symfony is a web application framework.
2. Symfony support MVC design pattern.
3. Symfony is a set of reusable PHP components to build web applications, APIs, microservices and web services.

In PHP Language.

1. Fast Development:

   Reusing generic components/Libraries- Symfony provides many such components and libraries which can be reused.

2. MVC Pattern:

   Symfony supports MVC design pattern.

3. Unlimited flexibility
4. Expandable
5. Stable and sustainable
6. Ease of use.

>> To create your new Symfony application, first make sure you're using PHP 7.1 or higher and have Composer installed

>> Run the following command in cmd to install Symfony using Composer

composer create-project symfony/website-skeleton myFirstProject

The website-skeleton is optimized for traditional web applications. If you are building microservices, console applications or APIs, consider using the much simpler skeleton project:

composer create-project symfony/skeleton myFirstProject

cd myFirstProject
composer require symfony/web-server-bundle --dev

>> Move into your new project and start the server:

cd myFirstProject
php bin/console server:run

Open your browser and navigate to http://localhost:8000 If everything is working, you'll see a welcome page.

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Syntax: $request->query->get("paraemeter_name");

use Symfony\Component\HttpFoundation\Request;

public function updateAction(Request $request)
{
    // $_GET parameters
    $request->query->get('name');

    // $_POST parameters
    $request->request->get('name');
	
}

//You can also get all the form values as array by using the following:
$request->request->all();

Twig is a modern fast, flexible, and secure template engine for PHP.

You can get current route in Symfony using following code:

$request->get("_route");

//OR with Twig 
{{ app.request.attributes.get('_route') }}

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Symfony provides a serializer to serialize/deserialize to and from objects and different formats (e.g. JSON or XML).

composer require symfony/serializer-pack

The form helpers provide a faster way to write form inputs in templates, especially for complex elements such as dates, drop-down lists, and rich text.

In Symfony, following form helper functions are given below:

• form_tag()
• input_tag()
• input_password_tag()
• input_hidden_tag()
• textarea_tag()
• input_file_tag()
• select_tag()
• options_for_select()
• checkbox_tag()
• submit_tag()

// Text field (input)
echo input_tag('name', 'default value');
=> 

// Long text field (text area)
echo textarea_tag('name', 'default content', 'size=10x20');
=> default content
 
// Check box
echo checkbox_tag('single', 1, true);
=> 
 
// To specify option names, use an associative array
echo select_tag('name', options_for_select(array(
  'male'  => 'Male',
  'female'    => 'Female',
  'others' => 'Others'
), 'Male'));

=> 
	Male
    FeMale
    Others
   
 
// Upload file field
echo input_file_tag('name');
=> 
 
// Password field
echo input_password_tag('name', 'value');
=> 
 
// Hidden field
echo input_hidden_tag('name', 'value');
=> 
 
// Submit button (as text)
echo submit_tag('Save');
=>