Create a chicken in 4 hours with NO external dependencies or extensions. 2016-11-07 06:54 UTC



Chicken Challenge


Create a PHP class or classes that instantiate an object that represents a chicken (the animal). Your chicken class should demonstrate understanding of object oriented programming principles including (but not limited to)

  • inheritance
  • encapsulation
  • single-responsibility.

Your chicken must be able to be run through a PHP interpreter without any external dependencies. It should follow PSR-2 standards and include unit tests.


  • PHP, GiT, Terminal are accessible
  • Composer can be used to generate the application class auto loader
  • Composer can be used to check PHP minimal requirements
  • Minimal 3rd part library usage, should not be core of demo


Latest Stable Version Total Downloads Latest Unstable Version License Monthly Downloads Daily Downloads composer.lock available



cd {project root}
git clone 

VM / Container services

IF Vagrant is available:

vagrant up
vagrant ssh

IF docker is available (very early alpha, YMMV)

docker-compose up --build
docker exec -it chickenchallenge_app_1 bash
apt-get update && apt-get install wget
  • Run the application commands inside the container

Install dependencies

wget http://getcomposer.org/composer.phar
php composer.phar install --profile --prefer-dist -o

Running the app

Change directory to the root of the project

php ./index.php


Testing requires PHPUnit, easiest way to get PHPUnit is via composer

cd {project root}
wget https://phar.phpunit.de/phpunit.phar
php ./vendor/bin/phpunit ./tests

Coding style

To ensure PSR-2 compliant occasionally run the following

wget https://squizlabs.github.io/PHP_CodeSniffer/phpcs.phar
php phpcs.phar --standard=PSR2 --ignore="*/vendor/*","*/sapi/*" --report-diff=./PSR2.diff ./
patch -p0 -ui ./PSR2.diff

Auto Generating Documentation

wget http://phpdoc.org/phpDocumentor.phar
php phpDocumentor.phar -p -t ./sapi -d ./src
  • Note: GraphViz is required to generate inheritance tree visuals.