Description:
------------
It would be awesome to have a SORT_VERSION flag for the sort family of functions, whose behavior would be to sort most common multi-number version strings (with possible support for detecting -cvs, -rc, -svn, and other suffixes).

For example, SORT_NUMERIC and SORT_STRING both fail to properly sort the following version numbers:

1.2.1
1.2.2
1.2.10
1.20.5
1.22.50

They get sorted as:

1.20.5
1.2.1
1.2.10
1.2.2
1.22.50

Code I used to work around it is below:

Reproduce code:
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function vercmp($a, $b) {
  $as = explode('.', $a);
  $bs = explode('.', $b);
  for ($i = 0, $e = max(count($as), count($bs)); $i != $e; ++$i) {
    if ($as[$i] < $bs[$i])
      return -1;
    elseif ($as[$i] > $bs[$i])
      return 1;
  }
  return 0;
}