Brain teaser - php array manipulation : I have following array:
<pre>

array(174) {
  [0]=>
  string(5) "3.0.3"
  [1]=>
  string(5) "3.0.2"
  [2]=>
  string(5) "3.0.1"
  [3]=>
  string(5) "3.0.0"
  [9]=>
  string(5) "2.9.5"
  [10]=>
  string(5) "2.9.4"
  [11]=>
  string(5) "2.9.3"
  [12]=>
  string(5) "2.9.2"
  [13]=>
  string(5) "2.9.1"
  [14]=>
  string(5) "2.9.0"
  [18]=>
  string(6) "2.8.11"
  [19]=>
  string(6) "2.8.10"
  [20]=>
  string(5) "2.8.9"
}

</pre>
I need to find the highest 3rd number for unique pair of first two numbers x.x. With this example the expected result must be 3.0.3, 2.9.5, 2.8.11.
