排序第四元素上並保持相同的密鑰值在PHP

Question

我有多個陣列結構如下

array (
    'Mexico' => 
    array (
    'Regular_Club' => 
    array (
     '2015-02' => 
     array (
     'cost' => 41479.8, 
     'signups' => 3891, 
     'share' => 16241.46, 
    ), 
    ), 
    'Sweepstakes' => 
    array (
     '2015-02' => 
     array (
     'cost' => 1186736.04, 
     'signups' => 280850, 
     'share' => 468069.14, 
    ), 
    ), 
), 
) 

我要作爲排序依據現場成本這個數組降序排列。我嘗試過uasort，但是沒有運氣。結果應該在下面。

Result: 
array (
    'Mexico' => 
    array (
    'Sweepstakes' => 
    array (
     '2015-02' => 
     array (
     'cost' => 1186736.04, 
     'signups' => 280850, 
     'share' => 468069.14, 
    ), 
    ), 
    'Regular_Club' => 
    array (
     '2015-02' => 
     array (
     'cost' => 41479.8, 
     'signups' => 3891, 
     'share' => 16241.46, 
    ), 
    ), 

), 
) 

在此先感謝。

Answer 1

Coolect前成本和使用uksort：

foreach ($inputArray as $country => $array) { 
    foreach($array as $key => $value) 
    foreach ($value as $val) $weight[$key] = (int) $val['cost']; 
     uksort($array, function ($k1, $k2) use ($weight) { return $weight[$k2] - $weight[$k1]; });  
    $resultArray = array($country => $array); 
} 

var_export($resultArray);