How to use array_walk_recursive

Question

How can I use array_walk_recursive() instead of this:

function check_value($val){
  if(is_array($val)){
    foreach($val as $key => $value)
      $val[$key] = check_value($value);
    return $val;
  }

  return clean_value($val);
}

?

Answer 1

I think this should do the same thing. Note that argument of a function is passed as a reference (i.e. &$value).

array_walk_recursive($array, function(&$value) {
    $value = clean_value($value);
});

For older PHP versions:

function check_value(&$value) {
    $value = clean_value($value);
}
array_walk_recursive($array, 'check_value');