<?php
 
class A {
	public $property;
	public $propertyForB;
 
	public function __construct() {
		$this->propertyForB = new B();
	}
 
	public function hello() {
		$this->property = 'hello';
		return $this;
	}
 
	public function world() {
		$this->property .= ' world';
		return $this->property;
	}
}
 
 
class B {	
	public function helloWorld() {
		return 'hello world';
	}
}
 
 
$test = new A();
 
echo $test->hello()->world();
 
echo '<br />';
 
echo $test->propertyForB->helloWorld();

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