Description:
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Classes appear to be correct[1]:

  <link rel="canonical" href="http://php.net/manual/en/class.iterator.php">
  <link rel="shorturl" href="http://php.net/iterator">

Methods include the language-specific URL instead of "http://php.net/class.method":

  <link rel="canonical" href="http://php.net/manual/en/iterator.rewind.php">
  <link rel="shorturl" href="http://php.net/manual/en/iterator.rewind.php">

Functions appear to be correct:

  <link rel="canonical" href="http://php.net/manual/en/function.iterator-to-array.php">
  <link rel="shorturl" href="http://php.net/iterator-to-array">

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[1]: Iterator may be an edge case, since http://php.net/iterator is also the canonical URL for http://php.net/language.oop5.iterations -- the Iterator interface like needs to be http://php.net/class.iterator.