php如何獲得數組的數組鍵值

我有以下設置，我試圖使用數組結構的數組。一旦在數組數組中找到值，我不確定如何獲取鍵值。php如何獲得數組的數組鍵值

$testboat = 'smallest boat'; 
$allboats = array(40=>array(1=>'big boat', 
          2=>'bigger boat' 
        ), 
        30=>array(1=>'little boat', 
          2=>'tiny boat', 
          3=>'smallest boat')); 

foreach($allboats as $boats){ 
    foreach($boats as $boat){ 
     if($testboat == $boat) { 

     /*looking to echo the key or value 30; */ 

     } 

    } 
}

來源

2016-12-14 DCR

'foreach（$ boats as $ key => $ boat）'將會是一個開始。 – deceze

謝謝，但我發現這是錯誤的地方開始。（$ allboats作爲$ key => $ boats）提供了正確的位置。 – DCR

使用$key => $value語法foreach()。此外，通過內部陣列無需循環：

foreach($allboats as $key => $boats){ 
    if(in_array($testboat, $boats)) { 
     echo $key; 
     break; //if you want to stop after found 
    } 
}

如果你想要得到的外鍵和內部密鑰：

foreach($allboats as $key => $boats){ 
    if(($inner_key = array_search($testboat, $boats)) !== false) { 
     echo "$key and $inner_key"; 
     break; //if you want to stop after found 
    } 
}

來源

2016-12-14 21:32:51 AbraCadaver

我可以知道'！== false'什麼嗎？ – FullStack

@FullStack嚴格不等於false，因爲'array_search'可以返回0作爲一個鍵，它會鬆散地評估爲false。 – AbraCadaver

$testboat = 'smallest boat'; 
$allboats = array(40=>array(1=>'big boat', 
          2=>'bigger boat' 
        ), 
        30=>array(1=>'little boat', 
          2=>'tiny boat', 
          3=>'smallest boat')); 

foreach($allboats as $id => $boats){ 
    //$id will be 40, then 30 
    foreach($boats as $id2 => $boat){ 
     //$id2 will be 1,2... 
     if($testboat == $boat) { 
     echo $id . '-' . $id2; 
     /*looking to echo the key or value 30; */ 

     } 
    } 
}

來源

2016-12-14 21:27:10 Iarwa1n

你必須做到以下幾點：

foreach($allboats as key1 => $boats){ 
    foreach($boats as key2 => $boat){

來源

2016-12-14 21:36:17

php如何獲得數組的數組鍵值

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