PHP :: Learn Namespace

learn-namespace.php

<?php

// Main namespace
namespace Haris\Learn\OONamespace;

// Constant
const FILE = __FILE__;

// Require files
require_once dirname(FILE) . '/module-one.php';
require_once dirname(FILE) . '/module-two.php';
require_once dirname(FILE) . '/module-three.php';

// Init
ModuleOne\init();

module-one.php

<?php

namespace Haris\Learn\OONamespace\ModuleOne;
use Haris\Learn\OONamespace\ModuleTwo;
use Haris\Learn\OONamespace\ModuleThree;

function init() {
	echo "initialize machine..";

	$boot = ModuleTwo\Boot::getInstance();
	$boot->engine_check();
	$boot->fuel_oil_check();

	// fill fuel and oil
	ModuleThree\fill_fuel_and_oil();
}

module-three.php

<?php

namespace Haris\Learn\OONamespace\ModuleThree;

Class Fuel {
	private static $volume = 0;

	static function status() {
		printf("<br>&nbsp; fuel volume: %s", self::$volume);
	}

	static function fill() {
		self::$volume = 100;
	}
}

Class Oil {
	private static $volume = 0;

	static function status() {
		printf("<br>&nbsp; oil volume: %s", self::$volume);
	}

	static function fill() {
		self::$volume = 80;
	}	
}

// do fill fuel and oil
function fill_fuel_and_oil() {
	printf("<br>%s", 'filling the fuel and oil..');

	// filling
	Fuel::fill();
	Oil::fill();

	// echo status
	Fuel::status();
	Oil::status();
}

module-two.php

<?php

namespace Haris\Learn\OONamespace\ModuleTwo;
use Haris\Learn\OONamespace\ModuleThree;

Class Boot {
	// instance
	private static $instance;

	// variable
	private $engine_version = '2.0';
	private $engine_cc = '2500';
	
	public static function getInstance() {
		if(! isset(self::$instance)) {
			self::$instance = new self;
		}

		return self::$instance;
	}	

	public function engine_check() {
		printf("<br>%s", 'checking engine..');
		$this->display_status();
	}

	public function fuel_oil_check() {
		printf("<br>%s", 'checking fuel and oil..');
		ModuleThree\Fuel::status();
		ModuleThree\Oil::status();
	}

	private function display_status() {
		printf("<br>&nbsp; engine version: %s", $this->engine_version);
		printf("<br>&nbsp; engine cc: %s", $this->engine_cc);
	}

	private function __construct() {
		/* private for singleton purpose */
	}
}