用數字替換數組中的一個值

Question

我對數組的轉換有問題。 我有這樣的陣列：

Array 
    (
    [0] => Array 
    (
     [x] => 1291 
     [y] => 32 
     [z] => 1142 
     [number] => 51 
    ) 

    [1] => Array 
    (
     [x] => 1415 
     [y] => 32 
     [z] => 1142 
     [number] => 22 
    ) 
) 

如何從這個做出，陣列

Array 
    (
    [51] => Array 
    (
     [x] => 1291 
     [y] => 32 
     [z] => 1142 
    ) 

    [22] => Array 
    (
     [x] => 1415 
     [y] => 32 
     [z] => 1142 
    ) 

) 

[數字]不必從陣列中移除。重要的是要成爲關鍵。

Answer 1

$numbers = array(); 
//Get the list of 'number' keys and unset them (optional) 
foreach ($array as &$values) { 
    $numbers[] = $values['number']; 
    unset($values['number']); 
} 
//create a new array with numbers as keys and the original array as values 
//You could also overwrite the original array, which will save some memory 
$result = array_combine($numbers, $array); 

Answer 2

您可以創建一個新的數組

$newarray = array(); 
foreach($yourarray as $k=>$v) { 
    $newarray[$v['number']] = $v 
} 

print_r($newarray); 

Answer 3

超過您最初的陣列的簡單循環可以解決這個問題：

$new = array(); 

foreach($old as $item) { 
    $key = $item['number']; 
    $new[$key] = $item; 
} 

var_dump($new); 

Answer 4

無需創建一個新的數組，因爲許多其他的答案表明，這可以在原地完成。

foreach ($array as $key => $value) 
{ 
    $array[$value["number"]] = $array[$key]; 

    // remove number attribute (optional) 
    unset($array[$value["number"]]["number"]); 

    // remove array @ original key 
    unset($array[$key]); 
}