$input = array(1,4,7,9,8,6,2,5,3);
我试图根据以下规则计算每个数字的重要性：
As the sequence gets longer the numbers get less significant,and each time a number is mentioned then it will improve the relevance (how much depends on its position in the
sequence).
我期待的是：
Array( '4' => 90% '1' => 75% '7' => 60% .... )
$numbers = array(1,3);
$weight = array();
$count = count($numbers);
for ($i=0; $i<$count; $i++) {
if (!isset($weight[$numbers[$i]])) $weight[$numbers[$i]] = 1;
$weight[$numbers[$i]] += $count + pow($count - $i,2);
}
$max = array_sum($weight);
foreach ($weight as &$w) {
$w = ($w / $max) * 100;
}
arsort($weight);
结果：
Array
(
[4] => 34.5997286296
[7] => 17.3677069199
[1] => 16.3500678426
[8] => 10.0407055631
[9] => 9.29443690638
[6] => 5.42740841248
[2] => 4.40976933514
[5] => 1.35685210312
[3] => 1.15332428765
)
