如何在另一个阵列中显示数组的名称

Question

所以我在采访中遇到了一个问题，它说的是这样的：在所有条件下找到平均得分最高的轮胎，并且如果轮胎得分较低在任何情况下都不得超过5分。

$tires=[ 
    'Desert'=>array('dry'=>10, 'wet'=>4, 'snow'=>1), 
    'Ocean'=>array('dry'=>6, 'wet'=>8, 'snow'=>6), 
    'RainForest'=>array('dry'=>6, 'wet'=>10, 'snow'=>6), 
    'Glacier'=>array('dry'=>4, 'wet'=>9, 'snow'=>10), 
    'Prairie'=>array('dry'=>7, 'wet'=>7, 'snow'=>7), 
]; 
$max=0; 
foreach($tires as $key){ 
    $total=0; 
    foreach($key as $condition=>$score){ 
     if($score>5){ 
      $total=$total+$score; 
     }else{ 
      $total=-150000; 
     } 
    } 
    $total=$total/3; 
    if($total>$max){ 
     $max=$total; 
     $bestTire=$key; 
    } 
} 
echo $bestTire." is the best tire with the score: ".$max; 

输出说：注意：数组字符串转换在C：\ XAMPP ... 阵列与成绩最好的轮胎：7.3333333333333

的问题是，我该怎么办到节目的名字“热带雨林”，而不是“数组”

谢谢

Answer 1

你有混淆的名称，解决这些问题：

$tires=[ 
    'Desert'=>array('dry'=>10, 'wet'=>4, 'snow'=>1), 
    'Ocean'=>array('dry'=>6, 'wet'=>8, 'snow'=>6), 
    'RainForest'=>array('dry'=>6, 'wet'=>10, 'snow'=>6), 
    'Glacier'=>array('dry'=>4, 'wet'=>9, 'snow'=>10), 
    'Prairie'=>array('dry'=>7, 'wet'=>7, 'snow'=>7), 
]; 
$max=0; 
foreach($tires as $tire => $conditions){ // note key and value 
    $total=0; 
    foreach($conditions as $condition => $score){ // note array name 
     if($score>5){ 
      $total=$total+$score; 
     }else{ 
      $total=-150000; 
     } 
    } 
    $total=$total/3; 
    if($total>$max){ 
     $max=$total; 
     $bestTire = $tire; // note key name 
    } 
} 
echo $bestTire." is the best tire with the score: ".$max; 

Answer 2

您应该阅读有关foreach()如何工作。

foreach($tires as $key => $value) { 
    // $key is your tire name 
    // $value is the array of data for that tire 
} 

Answer 3

试试这个：

$minimumScore = 5; 

// remove tires that have a single rating less than minimum 
$filtered = array_filter($tires, function (array $data) use ($minimumScore) { 
    return min($data) >= $minimumScore; 
}); 

// calculate scores as average of score per category 
$scores = array_map(function (array $data) { 
    return array_sum($data)/count($data); 
}, $filtered); 

// find maximum of scores 
$bestScore = max($scores); 

// find keys with the best score 
$bestTires = array_keys($scores, $bestScore); 

// there could be more than one tire with same score, pick the first 
$bestTire = array_shift($bestTires); 

echo sprintf(
    '%s is the best tire with the score: %s', 
    $bestTire, 
    $bestScore 
); 

仅供参考，请参阅：

• http://php.net/manual/en/function.array-filter.php
• http://php.net/manual/en/function.array-map.php
• http://php.net/manual/en/function.array-sum.php
• http://php.net/manual/en/function.count.php
• http://php.net/manual/en/function.max.php
• http://php.net/manual/en/function.array-keys.php
• http://php.net/manual/en/function.array-Shift.php

有关示例，请参见：

• https://3v4l.org/5L5Xn