Fungsi berantai (chained method/function) pada PHP.

Chained.php

<?php 

/**
 * Simple chained method in PHP
 *
 * @link http://laravel.web.id/tips-trik/membuat-fungsi-berantai-chained-methodfunction-di-php/
 * @copyright 2016
 */
class User {

	/**
	 * Users Name
	 * 		
	 * @var string
	 */
	private $name = null;

	/**
	 * User Email
	 * 
	 * @var string
	 */
	private $email = null;

	public function __construct($data = null)
	{
		// set default data
		if (! empty($data)) {
			foreach ($data as $key => $value) {
				if (property_exists($this, $key)) {
					$this->$key = $value;
				}
			}
		}
	}

	/**
	 * Return data as JSON formatted using json() method
	 * 
	 * @return string
	 */
	public function __toString()
	{
		return $this->json();
	}

	/**
	 * Set default name
	 * 
	 * @param string $name
	 * @return object
	 */
	public function setName($name)
	{
		$this->name = $name;
		return $this;
	}

	/**
	 * Set default email
	 * 
	 * @param string $email
	 * @return object
	 */
	public function setEmail($email) 
	{
		$this->email = $email;
		return $this;
	}

	/**
	 * Return as JSON formatted string
	 * 
	 * @return string
	 */
	public function json()
	{
		return json_encode([
			'name' => $this->name,
			'email' => $this->email
		]);
	}
}

// simple function
if (! function_exists('user')) {
	function user($user = null) {
		return new User($user);
	}
} 

// instance class
$user = new User;
echo $user->setName('Laravel.web.id')
	->setEmail('mail@laravel.web.id')
	->json();

// simpler class instance
echo (new User)->setName('Laravel.web.id')->setEmail('mail@laravel.web.id')->json

// simple function
echo user()->setName('Laravel.web.id')
	->setEmail('mail@laravel.web.id')
	->json();

// simple function with __construct
echo user(['name' => 'Laravel.web.id', 'email' => 'mail@laravel.web.id'])->json();

// simple function with __construct and __toString
echo user(['name' => 'Laravel.web.id', 'email' => 'mail@laravel.web.id']);