decorator pattern

gistfile1.php

<?php

interface Decorable {
  public function doSomething();
}

interface Decorator extends Decorable {
  public function __construct(Decorable $target);
}

class Something implements Decorable {
  public function doSomething() {
    return true;
  }
}

class Somehow implements Decorator {
  protected $target;
  public function __construct(Decorable $target) {
    $this->target = $target;
  }
  public function doSomething() {
    // do some stuff before or after calling the method
    return $this->target->doSomething();
  }
}

// RUN ...
$foo = new Something();
$bar = new Somehow($foo);
$bar->doSomething();