在我试图找到一个完美的排名解决方案时,我一直坚持给出正确的排名。代码将解释我想要实现的目标:
我有以下数组:
$standings = array(
'player_1' => 30,
'player_2' => 26,
'player_3' => 28,
'player_9' => 28
);
现在为了用关系排名,我有以下功能:
function setRanking($standings) {
$rankings = array();
arsort($standings);
$rank = 1;
$tie_rank = 0;
$prev_score = -1;
foreach ($standings as $name => $score) {
if ($score != $prev_score) { //this score is not a tie
$count = 0;
$prev_score = $score;
$rankings[$name] = array('score' => $score, 'rank' => $rank);
} else { //this score is a tie
$prev_score = $score;
if ($count++ == 0) {
$tie_rank = $rank - 1;
}
$rankings[$name] = array('score' => $score, 'rank' => $tie_rank);
}
$rank++;
}
return $rankings;
}
echo '<pre>';
print_r(setRanking($standings));
输出:
Array
(
[player_1] => Array
(
[score] => 30
[rank] => 1
)
[player_3] => Array
(
[score] => 28
[rank] => 2
)
[player_9] => Array
(
[score] => 28
[rank] => 2
)
[player_2] => Array
(
[score] => 26
[rank] => 4
)
)
预期产出:
Array
(
[player_1] => Array
(
[score] => 30
[rank] => 1
)
[player_3] => Array
(
[score] => 28
[rank] => 2
)
[player_9] => Array
(
[score] => 28
[rank] => 2
)
[player_2] => Array
(
[score] => 26
[rank] => 3
)
)
问题是它将排名打印为1,2,2,4
,而根据我的假设它应打印1,2,2,3
。那怎么打印1,2,2,3?哪里可能出错?任何帮助表示赞赏。感谢。
答案 0 :(得分:4)
只需更改您的其他块,您不会减少$rank
值,因此它保持相同的值。你只需执行$rank - 1
因为它只需少于1来存储变量而不更改主值。
foreach ($standings as $name => $score) {
if ($score != $prev_score) { //this score is not a tie
$count = 0;
$prev_score = $score;
$rankings[$name] = array('score' => $score, 'rank' => $rank);
} else { //this score is a tie
$prev_score = $score;
$rank--; // Decrements here
if ($count++ == 0) {
$tie_rank = $rank;
}
$rankings[$name] = array('score' => $score, 'rank' => $tie_rank);
}
$rank++;
}
return $rankings;