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calculate ELO

ed987 asked
Last Modified: 2012-05-05
function k_elo($e)

  if($e<$el)return $kl;
  if($e>$eh)return $kh;
  return ($eh-$e)*($kl-$kh)/($eh-$el)+$kh;
function calcELO(&$n1,&$n2,$won1,$canTie)

  if($won1==2)$sa=1;   //won
  if($won1==1)$sa=0.5; //even
  if($won1==0)$sa=0;   //lost


script above supposed to calculate ELO.
but it doesn't take information on previous games played !
how does one do that ?
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