與嵌套計數數組的值

Question

我有以下陣列，這是嵌套在一個更大的陣列陣列的負載：

Array 
(
    [0] => Array 
     (
      [vote_for] => 15 
     ) 

    [1] => Array 
     (
      [vote_for] => 15 
     ) 

    [2] => Array 
     (
      [vote_for] => 15 
     ) 

    [3] => Array 
     (
      [vote_for] => 5 
     ) 

    [4] => Array 
     (
      [vote_for] => 5 
     ) 

    [5] => Array 
     (
      [vote_for] => 2 
     ) 

    [6] => Array 
     (
      [vote_for] => 2 
     ) 

    [7] => Array 
     (
      [vote_for] => 2 
     ) 

    [8] => Array 
     (
      [vote_for] => 2 
     ) 

    [9] => Array 
     (
      [vote_for] => 2 
     ) 

    [10] => Array 
     (
      [vote_for] => 2 
     ) 

    [11] => Array 
     (
      [vote_for] => 2 
     ) 

    [12] => Array 
     (
      [vote_for] => 2 
     ) 

    [13] => Array 
     (
      [vote_for] => 2 
     ) 

    [14] => Array 
     (
      [vote_for] => 2 
     ) 

) 

我想要做array_count_values的此陣列上的等價物，使得我得到15 => 3,5 => 2和2 => 10。我如何取消嵌套數組來做到這一點？

Answer 1

你可能想嘗試改革的數組數：

$count_array = array(); 
foreach ($arr as $v) { 
    $count_array[] = $v['vote_for']; 
} 

// Now get the counts 
$the_count = array_count_values($count_array); 

Answer 2

我覺得陣圖也將爲此

$count_array = array_map(function($item) { return $item['vote_for']; }, $array); 
$the_count = array_count_values($count_array);