Mordern.php

<?php
interface stuffShouldDo{
  public function whoo();
}
class stuffDoer implements stuffShouldDo{
  public function __construct(){
    
  }
  
  public function oneFunction(){
    //Do stuff
    //Method chaining
    return $this;
  }
  
  public function anotherFunction(){
    //last one in chain
  }
}

$foo = new stuffDoer();
$foo->oneFunction()->anotherFunction();