PHP Recursively walk array and link element...

interclubs used Ask the Experts™
I have a large array (with a bunch of sub arrays) and I want to recursively go through it, and if the key ='id' I want to change the value to be:
<a href="?[this_value]">[this_value]</a>
where [this_value] is the value of the id key.

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function replace_id(&$val, $key)
    if ($key == 'id')
      $val = "<a href=\"?$val\">$val</a>";
array_walk_recursive($large_array, 'replace_id');

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