/**
* Compares the weights of two edges and returns -1, 0, 1 depending
* on which is the largest first, equal, or second
*
* @param Edge $edge1 first Edge to compare
* @param Edge $edge2 second Edge to compare
* @return int -1,-0,1 as described above
*/
function compare($edge1, $edge2)
{
$values1 = $edge1->getCost();
$values2 = $edge2->getCost();
if ($values1 == $values2) {
return 0;
}
return $values1 > $values2 ? -1 : 1;
}