PHP Design Pattern

factory.php

<?php
//http://www.phptherightway.com/pages/Design-Patterns.html

class Automobile
{
    private $vehicleMake;
    private $vehicleModel;

    public function __construct($make, $model)
    {
        $this->vehicleMake = $make;
        $this->vehicleModel = $model;
    }

    public function getMakeAndModel()
    {
        return $this->vehicleMake . ' ' . $this->vehicleModel;
    }
}

class AutomobileFactory
{
    public static function create($make, $model)
    {
        return new Automobile($make, $model);
    }
}

// have the factory create the Automobile object
$veyron = AutomobileFactory::create('Bugatti', 'Veyron');

print_r($veyron->getMakeAndModel()); // outputs "Bugatti Veyron"

singleton.php

<?php

// http://phpenthusiast.com/blog/the-singleton-design-pattern-in-php

class ConfigSingleton
{
    /**
     * @var [type]
     */
    private static $instance = null;

    /**
     * @var string
     */
    private $firstName;

    /**
     * @var string
     */
    private $lastName = 'default';

    // The constructor is private
    // to prevent initiation with outer code.
    private function __construct()
    {
        echo 'Created instance Config Object.';
    }

    public static function getInstance()
    {
        if (static::$instance === null) {
            static::$instance = new ConfigSingleton();
        }

        return static::$instance;
    }

    public function getFullName(): string
    {
        return $this->firstName.' '.$this->lastName;
    }

	/**
	 * Get the value of First Name
	 * @return string
	 */
	public function getFirstName() {
		return $this->firstName;
	}

	/**
	 * Set the value of First Name
	 * @param string $firstName
	 * @return self
	 */
	public function setFirstName(string $firstName) {
		$this->firstName = $firstName;
		return $this;
	}

	/**
	 * Get the value of Last Name
	 * @return string
	 */
	public function getLastName() {
		return $this->lastName;
	}

	/**
	 * Set the value of Last Name
	 * @param string $lastName
	 * @return self
	 */
	public function setLastName(string $lastName) {
		$this->lastName = $lastName;
		return $this;
	}

}

// Test
$config1 = ConfigSingleton::getInstance();
$config1->setFirstName('Nguyen');
$config1->setLastName('Nhu Tuan');
echo $config1->getFullName();
echo '<br/>';

$config2 = ConfigSingleton::getInstance();
echo $config2->getFullName();
echo '<br/>';

try {
    $config3 = new ConfigSingleton();
} catch(Error $e) {
    echo 'Can not implement create instance ConfigSingleton: '.$e->getMessage();
}

strategy.php

<?php
// http://www.phptherightway.com/pages/Design-Patterns.html

/*
Strategy
With the strategy pattern you encapsulate specific families of algorithms allowing the client class responsible for instantiating a particular algorithm to have no knowledge of the actual implementation. There are several variations on the strategy pattern, the simplest of which is outlined below:
This first code snippet outlines a family of algorithms; you may want a serialized array, some JSON or maybe just an array of data:
 */

interface OutputInterface
{
    public function load();
}

class SerializedArrayOutput implements OutputInterface
{
    public function load()
    {
        return serialize($arrayOfData);
    }
}

class JsonStringOutput implements OutputInterface
{
    public function load()
    {
        return json_encode($arrayOfData);
    }
}

class ArrayOutput implements OutputInterface
{
    public function load()
    {
        return $arrayOfData;
    }
}

// -----------------------------------------------------------------------------
class SomeClient
{
    private $output;

    public function setOutput(OutputInterface $outputType)
    {
        $this->output = $outputType;
    }

    public function loadOutput()
    {
        return $this->output->load();
    }
}

$client = new SomeClient();

// Want an array?
$client->setOutput(new ArrayOutput());
$data = $client->loadOutput();
var_dump($data);

// Want some JSON?
$client->setOutput(new JsonStringOutput());
$data = $client->loadOutput();
var_dump($data);