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Pythagorean triple in PHP

Pythagorean triple is every integer a, b and c for which a2 + b2 = c2 or in other words the a, b, and c are the sides of a right triangle. To generate triples in PHP, you can use the following function:

 
  function CalcTriple($n){
    $res = array();
    $res['a'] = (2*$n)+1;
    $res['b'] = (2*$n)*($n+1);
    $res['c'] = (2*$n)*($n+1)+1;
    return $res;
  }
 

$n is an Integer and the returned array contains the triple.
Unfortunately this function WON'T generate ALL triples. It just generates valid triples.
Seen on Wikipedia.