PHP 7.2 questions

php72questions.yaml

- question : "In which PHP version can I typehint a Object using the 'object' keyword ?"
  answers :
    - OK 7.2
    - KO 7.0
    - KO 7.1
    - none of above
    - KO 5.6
  component : PHP
  extra_link : http://php.net/manual/en/migration72.new-features.php

- question : "In which PHP version the void return type has been introduced ?"
  answers :
    - OK 7.1
    - KO 7.0
    - KO 7.2
    - none of above
    - KO 5.6
  component : PHP
  extra_link : http://php.net/manual/fr/migration71.new-features.php#migration71.new-features.void-functions

  - question : "Can I name a class `in_array` ?"
  answers :
    - OK Yes
    - KO No, built-in functions names are not valid
    - KO No Array built-in functions names are not valid
  component : PHP
  extra_link : http://php.net/manual/fr/reserved.php

  - question : "What will be the output of this code: `var_dump(1 <=> 2 ? true : false ? false : true);` ?"
  answers :
    - OK bool(false)
    - KO bool(true)
    - KO An Error
  component : PHP
  extra_link : http://php.net/manual/fr/language.operators.comparison.php

  - question : |
      "Is this code valid :"
      ```php
        class Foo {
          private $bar;
          public static function setBar($value)
          {
              $this->bar = $bar;
          }
        }
      ```
  answers :
    - OK No
    - KO Yes
  component : PHP
  extra_link : http://php.net/manual/fr/language.oop5.static.php#language.oop5.static.properties

  - question : "Who does support inheritance with the `extends` keyword ?"
  answers :
    - OK Class
    - OK Interface
    - KO Trait
    - KO Trait
  component : PHP
  extra_link : http://php.net/manual/fr/language.oop5.inheritance.php

  - question : |
      "Is this code valid :"
      ```php
        namespace App\Foo;
        class Bar{
            private $createdAt;
            public function __construct()
            {
               $this->createdAt = new Datetime();
            }
        }
        $bar = new Bar();
      ```
  answers :
    - OK No
    - KO Yes
  component : PHP
  extra_link : http://php.net/manual/fr/language.namespaces.fallback.php

  - question : |
      "Is this code valid :"
      ```php
        interface Bar {
            public function getBar() {}
        }
        interface Foo implements Bar {
            public function getFoo() {}
        }
      ```
  answers :
    - OK No
    - KO Yes, Since PHP 7.0
    - KO Yes, Since PHP 5.6
  component : PHP
  extra_link : http://php.net/manual/fr/language.oop5.interfaces.php

  - question : "How can I declare a function as abstract ?"
  answers :
    - OK public abstract function foo();
    - OK abstract public function foo();
  component : PHP
  extra_link : http://php.net/manual/fr/language.oop5.abstract.php

  - question :"Which kind of visibility is avaible for an abstract function ?"
  answers :
    - OK public
    - OK protected
    - OK private
    - KO final
  component : PHP
  extra_link : http://php.net/manual/fr/language.namespaces.fallback.php

  - question : "In which PHP version the finally keyword has been introduced ?"
  answers :
    - OK 5.5
    - KO 5.4
    - KO 5.3
    - KO 5.6
  component : PHP
  extra_link : http://php.net/manual/fr/language.exceptions.php

  - question : "Is it possible to redefine the visibility of a Trait method ?"
  answers :
    - OK Yes
    - KO No
  component : PHP
  extra_link : http://php.net/manual/fr/language.oop5.traits.php

    - question : "What is the built-in method to get names of all modules compiled and loaded ?"
  answers :
    - OK get_loaded_extensions
    - KO loaded_extensions
    - KO get_list_loaded_extensions
    - KO list_loaded_extensions
  component : PHP
  extra_link : http://php.net/manual/en/function.get-loaded-extensions.php

    - question : "Since Which PHP version the SPL extension is available and compiled by default ?"
  answers :
    - OK 5.0
    - KO 4.4
    - KO 5.3
    - KO 5.6
    - KO 7.0
  component : PHP
  extra_link : http://php.net/manual/en/spl.installation.php

      - question : "Does a token will prevent a xss attack ?"
  answers :
    - OK No
    - KO Yes
  component : PHP
  extra_link : https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)