array_walk のイテレーター版がほしい件

gistfile1.php

<?php  

// こんなの
class HogeIterator implements IteratorAggregate  
{  
    private   
        $innerIterator,  
        $callback;  
  
    public function __construct(Traversable $innerIterator, $callback)  
    {  
        $this->innerIterator = $innerIterator;  
        $this->callback = $callback;  
    }  
  
    public function getIterator()  
    {  
        foreach ($this->innerIterator as $key => $value)  
        {  
            $ret = call_user_func_array($this->callback, array(&$key, &$value));

            if ($ret)
                yield $key => $value;
        }  
    }  
}  
  
$origIterator = new ArrayIterator(range(1, 30));  
$iterator = new HogeIterator($origIterator, function(&$key, &$value) {  
    if (0 === $value % 3 && 0 === $value % 5)  
        $value = 'FizzBuzz';  
    elseif (0 === $value % 3)  
        $value = 'Fizz';  
    elseif (0 === $value % 5)  
        $value = "Buzz";  

    return true;
});  
  
foreach ($iterator as $value)  
    echo $value."\n";  

実行結果

1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz
16
17
Fizz
19
Buzz
Fizz
22
23
Fizz
Buzz
26
Fizz
28
29
FizzBuzz