is ruby like tap possible in php even in ?

gistfile1.php

<?php
class Tappable {
  private $whatever = null;

  public function __construct($whatever) {
    $this->whatever = $whatever;
  }


  public function tap(callable $callback) {
    $callback($this->whatever);
    return $this->whatever;
  }
}

$callback = function($h){
   echo "do sth with $h\n";
   echo "do sth else with $h\n";
};

// anyway you have to pollute your namespace here:
$x = new Tappable("123");
$x->tap($callback);

// because this will not work in php <= 5.6.4
(new Tappable("hakunamatata")).tap($callback);