與多維陣列作斗爭-有解無憂

我今天對 PHP 感到特別愚蠢和無能，所以正在尋求建議。我根本無法計算出從我的多維陣列中提取所需資訊的邏輯。我希望聰明善良的人可以幫助我克服我的心理障礙！

我有一個多維的香氣觀察陣列，如下所示：

$aroma_observations = array(
[0] => Array ( [sample] => 9043 [aroma] => NUT [intensity] => 1 ) 
[1] => Array ( [sample] => 9043 [aroma] => NUT [intensity] => 2 ) 
[2] => Array ( [sample] => 9043 [aroma] => SPICE [intensity] => 2 ) 
[3] => Array ( [sample] => 9043 [aroma] => SPICE [intensity] => 2 ) 
[4] => Array ( [sample] => 9043 [aroma] => SPICE [intensity] => 1 ) 
[5] => Array ( [sample] => 9043 [aroma] => PEPPER [intensity] => 1 ) 
[6] => Array ( [sample] => 9043 [aroma] => PEPPER [intensity] => 1 ) 
[7] => Array ( [sample] => 9043 [aroma] => PEPPER [intensity] => 2 ) 
[8] => Array ( [sample] => 9043 [aroma] => WOOD [intensity] => 2 ) 
[9] => Array ( [sample] => 9043 [aroma] => WOOD [intensity] => 2 ) 
[10] => Array ( [sample] => 9043 [aroma] => WOOD [intensity] => 2 ) 
[11] => Array ( [sample] => 4585 [aroma] => SPICE [intensity] => 1 ) 
[12] => Array ( [sample] => 4585 [aroma] => SPICE [intensity] => 2 ) 
[13] => Array ( [sample] => 4585 [aroma] => HERB [intensity] => 1 ) 
[14] => Array ( [sample] => 4585 [aroma] => HERB [intensity] => 2 ) 
[15] => Array ( [sample] => 4585 [aroma] => WOOD [intensity] => 2 ) 
[16] => Array ( [sample] => 4585 [aroma] => WOOD [intensity] => 2 ) 
[17] => Array ( [sample] => 4585 [aroma] => WOOD [intensity] => 2 ) 
[18] => Array ( [sample] => 2466 [aroma] => SPICE [intensity] => 1 ) 
[19] => Array ( [sample] => 2466 [aroma] => SPICE [intensity] => 2 ) 
[20] => Array ( [sample] => 2466 [aroma] => SWEET [intensity] => 1 ) 
[21] => Array ( [sample] => 2466 [aroma] => SWEET [intensity] => 1 ) 
[22] => Array ( [sample] => 2466 [aroma] => SWEET [intensity] => 2 ) 
[23] => Array ( [sample] => 2466 [aroma] => WOOD [intensity] => 2 ) 
[24] => Array ( [sample] => 2466 [aroma] => WOOD [intensity] => 3 ) )

我需要創建一個陣列，將其降低到每個樣品的每種香氣的最大強度- 如下所示：

$aroma_max_intensities = array ( 
[0] => Array ( [sample] => 9043 [aroma] => NUT [intensity] => 2 ) 
[1] => Array ( [sample] => 9043 [aroma] => SPICE [intensity] => 2 ) 
[2] => Array ( [sample] => 9043 [aroma] => PEPPER [intensity] => 2 ) 
[3] => Array ( [sample] => 9043 [aroma] => WOOD [intensity] => 2 ) 
[4] => Array ( [sample] => 4585 [aroma] => SPICE [intensity] => 2 ) 
[5] => Array ( [sample] => 4585 [aroma] => HERB [intensity] => 2 ) 
[6] => Array ( [sample] => 4585 [aroma] => WOOD [intensity] => 2 ) 
[7] => Array ( [sample] => 2466 [aroma] => SPICE [intensity] => 2 ) 
[8] => Array ( [sample] => 2466 [aroma] => SWEET [intensity] => 2 ) 
[9] => Array ( [sample] => 2466 [aroma] => WOOD [intensity] => 3 ) )

我一直在尋找最好的編碼方式，但一無所獲，因此非常感謝任何建議。

德國之聲

uj5u.com熱心網友回復：

您可以使用array_reduce回圈瀏覽這些專案，然后檢查該特定樣品/香氣的強度，如果它更高，則增加強度。

$results = array_values(array_reduce($aroma_observations, function($acc, $item) {
    if (!isset($acc[$item['sample'].$item['aroma']])) {
        $acc[$item['sample'].$item['aroma']] = $item;
    }
    if ((int)$item['intensity'] > $acc[$item['sample'].$item['aroma']]['intensity']) {
       $acc[$item['sample'].$item['aroma']]['intensity'] = (int)$item['intensity'];
    }
    return $acc;
}, []));

uj5u.com熱心網友回復：

從技術上講，這不是一個多維陣列，而是一個關聯陣列的陣列，可以“視為”一個物件陣列，其中每個物件具有以下結構：

[
  "sample" => ...,
  "aroma" => ...,
  "intensity" => ...,
]

所以你可以像處理一維陣列一樣處理這個問題，然后對每個條目的值做一些事情。其中每個條目將是如上所述的“物件”。

現在，預期的結果也將是這些“物件”的陣列，但只有強度最高的物件，所以你想要做的基本上是過濾原始陣列。

對于每個問題，總是有多種可能的解決方案，但這是我要做的：

我會保留一個索引，其中包含指向 $aroma_observations 中每個給定組合（樣品，香氣）的強度最高的條目的指標。

所以這個索引看起來像這樣：

[
  "sampleA.aromaA" => x,
  "sampleA.aromaB" => y,
  ...
]

其中 x, y... 是 $aroma_observations 中包含迄今為止最高強度的索引。

$indexOfMax = [];
for ($i = 0; $i < count($aroma_observations); $i  ) {
    $entry = $aroma_observations[$i];
    $indexOfMaxKey = "{$entry['sample']}.{$entry['aroma']}";
    if (!isset($indexOfMax[$indexOfMaxKey])) {
        // If the combination sample.aroma hasn't been indexed,
        // then add it now
        $indexOfMax[$indexOfMaxKey] = $i;
    } else {
        // The combination sample.aroma is in the index
        // Now, we compare the indexed intensity with the
        // current entry's intensity and update the index
        // if this new entry has a higher intensity
        
        // Take the pointer to the indexed aroma observation
        $indexedMax = $indexOfMax[$indexOfMaxKey];
        // Take the intensity corresponding to the indexed aroma observation
        $indexedIntensity = $aroma_observations[$indexedMax]['intensity'];

        if ($entry['intensity'] > $indexedIntensity) {
            $indexOfMax[$indexOfMaxKey] = $i;
        }
    }
}

echo '<pre>' . print_r($indexOfMax, true) . '</pre>';

然后，在完全填充 $indexOfMax 的情況下，我將構建結果陣列：

$result = [];
foreach ($indexOfMax as $key => $indexOfValue) {
    $parts = explode('.', $key);
    $sample = $parts[0];
    $aroma = $parts[1];
    $intensity = $aroma_observations[$indexOfValue]['intensity'];
    $result[] = [
        'sample' => $sample,
        'aroma' => $aroma,
        'intensity' => $intensity,
    ];
}

echo '<pre>' . print_r($result, true) . '</pre>';

uj5u.com熱心網友回復：

嘗試使用此代碼sample and aroma key of array

<?PHP
echo "<pre>";
$final_array = [];

foreach($aroma_observations as $arr){
  $final_array[$arr['sample'].'-'.$arr['aroma']]['sample'] = $arr['sample'];
  $final_array[$arr['sample'].'-'.$arr['aroma']]['aroma'] = $arr['aroma'];
  $final_array[$arr['sample'].'-'.$arr['aroma']]['intensity'] = (isset($final_array[$arr['sample']-$arr['aroma']]['intensity'])) ? $final_array[$arr['sample']-$arr['aroma']]['intensity']   $arr['intensity'] : $arr['intensity'];    
}

$final_array = array_values($final_array);

print_r($final_array);
?>

轉載請註明出處，本文鏈接：https://www.uj5u.com/qukuanlian/465656.html

標籤：php 数组

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