投票排名演算法(php版)，參考了reddit的排名演算法。<?php
演算法預習
abs:取絕對值
max:取最大值
log10:常用對數，log10(x) = y，隨著x的增大，y的增加越來越小
使用方法：
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
namespace common;
class votescore
function __construct($ups, $downs, $time)
$this->_ups = $ups;
$this->_downs = $downs;
$this->_time = $time;
基本問題
差值越大，得分越高
function score1()
$score = log10(max(abs($this->_ups - $this->_downs),1));
return $score;
解決爭議
總數越多，得分越高 1000:999 大於 10:9
1000:999 和 10:9 在score1裡得出的值相等，score2就是為了解決這個問題
function score2()
$sum = $this->_ups+$this->_downs;
if($sum < 1)elseif($this->_ups == $this->_downs)elseelseif($this->_ups == $this->_downs)else{
$y = -1;
if($this->_ups > 0){
$y = $y*(log10($this->_time)-9);
return $y;
public function getscore()
//預設都有一票贊成票和一票反對票
$this->_ups = $this->_ups+1;
$this->_downs = $this->_downs+1;
$score = $this->score1() + $this->score2() + $this->score3() + $this->score4();
$score = round($score, 4);
return $score;
測試資料如下：<?php
$ups = 2;
$downs = 0;
$time = time()+3600*24*2;
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 3;
$downs = 0;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 10;
$downs = 2;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 100;
$downs = 101;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 10000;
$downs = 10001;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 1000;
$downs = 100;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 1000;
$downs = 10;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 90;
$downs = 100;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 100;
$downs = 100;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 20;
$downs = 100;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 0;
$downs = 1;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 10;
$downs = 0;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
$ups = 0;
$downs = 1000;
$time = time();
$vote = new \common\votescore($ups, $downs, $time);
$score = $vote->getscore();
echo $score;
echo "\n";
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