uasort compare 3 or more values?

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I have a function that is used to rank teams.  It is as follows:

 

	function Compare_standings($ar1, $ar2){ 
	if ($ar1['pts']<$ar2['pts']) {
      			return 1;
	} else if ($ar1['pts']>$ar2['pts']) {
      			return -1;
	}
	if (in_array($ar1['id'],$ar2['teamsbeat'])) {
		return 1;
	} elseif (in_array($ar2['id'],$ar1['teamsbeat'])) {
		return -1;
	}
	if ($ar1['w']<$ar2['w']) {
	      	return 1;
	} else if ($ar1['w']>$ar2['w']) {
      		return -1;
	}
	if ($ar1['ga'] == 0) {
		$arg1 = 1;
	} else {
		$arg1 = $ar1['ga'];
	}
	if ($ar2['ga'] == 0) {
		$arg2 = 1;
	} else {
		$arg2 = $ar2['ga'];
	}
	if (($ar1['gf'] + $ar1['ga']) / $arg1 < ($ar2['gf'] + $ar2['ga']) / $arg2) {
	      	return 1;
	} elseif (($ar1['gf'] + $ar1['ga']) / $arg1 > ($ar2['gf'] + $ar2['ga']) / $arg2) {
      			return -1;
	}
   		return 0;
}

 

This all works perfect except at "if (in_array($ar1['id'],$ar2['teamsbeat'])) {", I need to check if any other teams in the array have the same amount of points (pts) and if they do, then if one of the tied teams has beaten all other tied teams, rank that team highest. 

 

I hope this is not too confusing.  I basically need to know if I can compare a 3rd value in this function somehow. 

 

Thanks. 

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Can anyone help?  I am stuck here.  Please take a look.  Thanks.